Anyway, I feel that the cpu is not getting any (or very few) clean winners with drops if I'm standing near enough to the baseline and if I use "autoposition trick" (same I would use to receive) to know where the ball is gonna come.
Could be that I'm using Ferrer and he's kinda fast too

Also,
I'd be totally for having acceleration and speed as separate skills as Ary1g suggested,
It's kinda what I've been saying for months: acceleration (reacting and starting to run) should be increased and speed (running itself) might be decreased (this thinking in the clean game with 100% speed)
That would also do the trick if you don't want to create a new skill (but it'd lead to an unbalanced/unrealistic result with a mod as ITST as it'd affect all the players equally).