The fair mode or realistic mode is good, but it does have such weakness:
#1 We can not make use of every skill: if we set all skill at 80% then the player won't be very competitive. so we have to set the player like a pure baseliner or top spiner or volleyer, but there won't be a federer. now theminimum skill number limited at 30%, it is more real, but not enough for a varied player who wants to show more.
#2 The backhand run just as good as forhand, that's not real. Forhand should be much stronger than backhand.
However, the free mode player is too strong at service, so I suggest a so-called "realistic free mode" as follows:
#1 backhand power limited at 70% or 80%
#2 service power limited at 80%
#3 other skills free