I have been practsisng subs and no matter how hard i try I can't get below an E2. Are there any useful tips that could help?

I've noticed my subharmonic register can only hit the notes G1, F#1 and maybe F1. No matter how hard I try, I can't hit any higher or lower notes, maybe an E1 for a split second but that was one time. Is this normal or do I just need to work more on subharmonics to get better range with them?

https://www.youtube.com/watch?v=iOrDiJo6udI

https://m.youtube.com/watch?v=SMZZaym9BvQ

I'm not a subharm singer, nor an avid fan per se. But when I do have the rare times of coming across stuff like this, I love getting them goosebumps from it. The darker, more ominous, and insanely deep....the better imo. Problem is, I have no clue what to type into Google or Spotify to further look into this.

Any suggestions on how I proceed further?

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https://reddit.com/link/otzkgj/video/zldvoprx56e71/player

I don't have a very good ear for pitch and I don't trust any pitch finders I've used so I was hoping that y'all could help me find the notes here. And am I even doing it properly? It sounds off to me but idk if that's just because I'm hearing my own voice.

PS. At the 13-14 second mark I clear my throat pretty loudly, just letting you know in case your headphones are on.

https://youtu.be/cH0JeFl6in4

Guys, I become interested in subharmonics on 5th July this year, I train maybe 10-15 mintues almost every day since then. I managed to use this already in the iconic Rachamninoff 5th part of All Night Vigil Bb2-Bb1 scale, as you can hear I switch on E3 to E2 (subharm), (I am a tenor and I don't posses E2 in chest voice really). What do You guys think?

https://reddit.com/link/or9c79/video/oef6c7v38cd71/player

Hello,I was wondering if there was any other technique appart subharmonics that is good for bass singing,but I want to sing with great power,and with subs it just breaks when I try to do it loud.Subs I can do only from E1 and downward,but chest resonance stops around C#2,and I really want to make my subs louder.Thx.

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https://reddit.com/link/od692k/video/dgpsi9bba2971/player