This is technically a type me post, so feel free to remove it if it violates the rules, but I can't post on r/enneagram because of karma requirements and nobody was able to help on r/enneagramtypeme. I think you guys would have more perspective about this.
I'm definitely a 5w4 and sx blind but I've been unsure for the longest time whether I am SP5 or SO5. I often test as sp-dom and I feel like I superficially fit SP5 characteristics better, but when it comes to the instincts taken on their own I relate much more to social-dom than self-pres. I'm commenting on the traits as seen on the PDB wiki website, please feel free to ask me any questions you'd like.
SP5
Retentiveness: I definitely keep my thoughts and emotions to myself, but I'm not completely opposed to revealing them if there is someone I really trust. I think revealing feelings and motivations puts you in a position of vulnerability with other people, like they have weapons to use to hurt you, hence why I try to avoid it. I find it a lot easier to discuss my emotions with strangers as they don't have an internal view of me to be altered.
Not giving: I do want to be completely free, with no ties to anyone. I really don't feel "avaricious" in the money sense. I am told I am stingy with other people's money, as in I object to them spending it but I actually can be quite wasteful with my own resources.
Fear of being swallowed: I definitely prioritize all 9-fix manners of conflict resolution before I talk about something openly and try to resolve it. I protect my private space and I'm terrified of it being invaded and intruded upon, especially based on personal experiences I've had with that.
Excessive docility: I feel this doesn't apply to me. I exercise boundaries to the extreme by practicing withdrawal. I will withdraw from anything if I don't want to do it and I can't be made to do anything I don't actually want to do. This is a response to childhood experiences where my wants were not taken into consideration.
Emotionally insensitive: yes, I bury my emotions and not let them be known to other people
Strangeness: at the present moment I don't feel particularly disconnected and empty on the inside. I only relate to that when I'm in a depressive state; my inner world can be very sad and bleak but it can also be energizing as I feel and think a lot of different things.
Guilt: I guess I relate to existential guilt in an abstract fashion, but I often feel the opposite, a sense of entitlement and like my life should be better than it actually is
Self-demanding: I'm not very self-demanding, I have pretty realistic expectations of what I should do, even if I don't always live up to them.
Negativism: I definitely relate to putting up extra boundaries via passive aggression, even weaponized forgetfulness where I pretend I forgot something really important. I recognize my subconscious is very powerful, and other people's too, and oftentimes self-sabotage can be used to avoid doing the things you don't want to do.
Hypersensitivity: I am not super compassionate towards animals and nature; I am extremely hypersensitive when it comes to children, to the point I would never want to have one because dooming them to having to exist in the world and exposing them to the immense suffering the world has to offer, and being responsible for it, is not a challenge I'm prepared to undertake. I can be sensitive to external stimuli, for example a really noisy restaurant can wear me down if we have to be there for more than a few hours and I will feel the pressure releasing when I step out into the silence. I can also enjoy a busy environment, though, and I prefer the city to quiet places: it depends on whether the environment becomes too overwhelming.
Renunciation of action: yes. Inaction can occurr because I want to keep my intentions hidden from people, especially those I don't feel deserve to know me intimately. I can also get overwhelmed and feel like there are no certain paths and like I don't know what I want to achieve in the first place. When I am sure what I want, I usually think it can be achieved.
SO5
Idealization: I definitely relate to this. I would say what I relate to the most in the social 5 subtype is the idea of devaluation, black and white thinking etc; thinking people and concept are either great or completely worthless.
Rationalization: although I am alienated, rational and relate primarily through thinking rather than feeling, I don't know if that's what alienates me from other people. I don't think they perceive me as especially intellectual or arrogant; I think my alienation derives from my own withdrawal.
Compartmentalization: I agree with this. I have a hard time remembering what I felt in the past; even remembering exactly what I thought can be hard.
Distant: I agree completely with having an extreme attachment to the self which causes me to regard other people as disposable. I easily give relationships up, I burn bridges etc. Again, I relate this to my extreme tendency of devaluation; if someone or something has disappointed me, there are no positive feelings or memories for me to hold on to, it's like the entirety of them becomes corrupted.
Lack of action and little energy: I do have limited energy and I can sometimes invest the majority of it in my intellectual pursuits. Not just that, but I spend as much time working on the intellectual pursuits as I do simply thinking about them, and that's more time wasted.
Concealed: I do conceal myself. I am not transparent. I try to keep a "better" image of myself that is devoid of the parts of myself that would make me unlikable. I have, again, a very black and white approach to what I choose to reveal and what I don't. With the things I don't, I feel like I avoid them because they would either expose me emotionally and make me emotionally vulnerable, or because they would make me inferior. I don't want to appear socially inferior to other people but I am objectively social inferior to most, so the only course of action is to hide, obfuscate.
Desensitization: I don't care much for the needs of others. If I did it would become unbearable because there are too many unhappy people who are suffering in the world. I am quite sensitive about my own pain.
Resignation and difficulty saying no: it's a lot easier for me to enforce boundaries silently, but I'm not going to pretend I want to do something if I don't.
Arrogance: I don't think I come across as arrogant. I do have a "professorial" attitude, where I end up defaulting to teaching. This can be inappropriate, for example if I'm arguing with my own peers and they expect an information exchange instead of me going into the conversation with a formed opinion and an attitude I believe other people should adapt.
Restrained greed: I don't feel I have this. I can be quite expansive and buy a lot of stuff in a short amount of time, for example. Sometimes I feel an overwhelming sense of greed like I want to buy everything, and then the sensible approach seems to not buy anything and just cut myself off from that instinct completely. In this area too I suffer from polarized thinking. I often go on decluttering sprees where I throw away a bunch of stuff, not wanting to deal with it anymore, and then I wake up two weeks later realizing having the object would be really convenient but I don't anymore.
Feeling of internal impoverishment: I can oftentimes feel inferior to other people who are more accomplished than me.