Long time player here. Even after many seasons, I am puzzled about how to create consistently high quality goalkeepers. It's a mystery, not even sure it's possible.

I've been toying with two ideas recently but am not sure they are working:

1) I train conditioning to 160% and all the white skills to 140%, or close to it.
2) I am platooning my defensive lineups (Gk, fullbacks, DMC), trying to use the same lineup in every case, betting that defenders who are more familiar with each other have a T11 game play advantage.

Any opinions, tips on the GK?