Hi :-)
I agree on the point, I'm also very much into the old cars with their mechanical marvels or simple simplicity.
But with the new season of IGOW, muscle memory and timings in turns are quite important. The official betaflight page on rates has a link to a nice calculator, it also has the formulas: www.desmos.com/calculator/r5pkxlxhtb
As an alternative, maybe you can tell which model do you use? So that I set up my quads in a similar way. Every one I tried differs ever so slightly.