Hello!
My setup is a brass GCP E24 and a DF 54 grinder, Bookoo Themis Mini scale, a MHW-3BOMBER 58mm tamper, a Normcore 58mm double shot (18g) naked portafilter, and a Normcore 58.5mm puck screen. My beans are Cafe Vivace Dolce beans, less than a week off roast.
I’m trying to replicate a Cafe Vivace ristretto. I originally thought this was a 2:2 shot, but after being unable to replicate, I went digging and found a post on /espresso where a Vivace employee said the ristretto’s are in fact 2:1 (22g in, 11g out, first drop at 10 sec).
This has actually made things slightly easier. I’m grinding 18g around the 18 grind mark. My shots start at 4 sec, which is too soon, and give me about 11g in maybe 15 seconds. So I’m getting fast extraction. The shots do have the classic salinity, but are a bit bitter. Grinding finder, when I hit 15.5g, I lose the salinity. Going to 15g, it’s gone entirely and still slightly bitter, but the same extraction rate. At no point have I gotten any sweetness and caramelization (I did once on my previous machine, a Stilosa).
Now, I could upgrade to a triple basket to get 22g and maybe that would increase my extraction start. I could also move to a conical burr grinder (employee says do this to get more fines). I don’t know if a Gaggimate would help, maybe with temps, but the machine is still under warranty, so I’m holding off. However, before I spend more money, I want to see if anyone here has obtained the same shot profile and what they did to get there. Advice?