Hm, maybe instead you like to match a degree instead of distance? So for 63.74° you use 100% match distance but for 170° you'd use 5.4% match distance. Your "base" degree would be personal preference and there's no magic number. But just as you approach 180° the match distance approaches 0, as you approach 0° the match distance will approach infinity. If you want to play around with it this will output what % of your hipfire sensitivity should be of your zoom sensitivity. So with what's already there, if your hipfire is 106.26 and zoom is 40 with a "match degree" of 63.74 then your zoom sensitivity would be 0.48 times hipfire. I expect this will feel far too high especially at lower FOVs due to the match distance thing but I could be wrong.