For what it's worth, I am a sandan in Kenpo and a sensei. The only way to really get the arts working for you is repitition. One move, one million repititions, as Professor Cerio used to say.
I know when my own instructor works with myself or the other black belts and senseis, he yells at us a lot to not critique ourselves while doing kata - that's his job and we cannot see our own mistakes in any case.
My advice - when you go into the dojo, do what the instructor says over and over again. He/she will make corrections as necessary to your technique. Try to incorporate them, but don't get caught up in trying to overanalyze. You have to build the muscle memory and then work with that.
