My problem with foot brake is that the preload involved. We’ve worked hard to get our car to leave off the brake properly. I can’t imagine the FB numbers would compare. Last weekend we were 1.27-1.29 60 leaving off a 3800 setting and not even lifting a front tire.
I've figured out how to to leave off idle when footbraking and still cut a decent light and 60 ft. Years ago I raised my idle until I could cut a decent light leaving at flickering of 3rd yellow. 1 less thing to have to think about.