Well I'd advise to change them whenever you can.
Actually the thing is change is constant, you have got to change a set piece routine whenever you are seeing the opponents are doing well against you, here in this routine its quite efficient I had it in my tactic too I make them myself and you...
Well then lets take u all to my adventure!
I'm gonna post some regen pics soon, I'm currently in my 28th session long career with Real Madrid CF n I like to create legacy, I always retain good regens until they retire from professional soccer.