How to determine the RPM for all in?

This is mostly street driven with a few track passes now and then for fun.
Definitely going to slow down the curve some by installing the second medium spring and try it.
Right now initial 20, final 32, with vacuum 36 but in way early I think.
Going to try to bring it all in at the tc stall 2500 or close and go from there per roccodart’s advice. Hey...I love making changes for the better. I guess I won’t really know how well it is for sure until I can get it out under load and these snow storms up here aren’t helping...lol