Hi there , i have a motion capture studio and i made a lot of complicated animations (dance , fight ) i know the problems of wrong keyframes of animations cuz this is what i do after capturing the animations , believe me i am the only who can fix your animations perfectly , i have already fixed feet positions for 6 mins animation frame by frame , this work need someone patience like me lol, anyway if you are interested please text me sir, i can handle all your futur works , just trust me , thank you.