Chris from Speier Racing Heads, where I got most of this fps info and formulas from, he seems to be 100% all in on it, I've seen other head ports argue him they seem to think it's more just guidelines.
Point is Chris for I think he said for stock eliminator seemed to shoot for 330 fps and he said some classes go as high as 350 fps I'm guessing it's got more to do with the rules than what's ideal. I just bring it up that there probably cases for not being ideal even if there is an ideal, I'm sure stock cars and road racing cars run higher fps etc..
Now I'm not saying this guy is right or wrong I really don't know too much about him.