I have the 4mm stroke, for shading I use the give almost fully closed, about half of a turn open, and I work around 9v with t-techs.
I didnt remove the stayup spring, cause I use the machine also with regular needles, But I removed the anti-noise spring, try it, the give system and the machine runs way better, just a bit more noise, but you can always increase the music volume hahaha