I didn't change slice length except if you're 2 meters or more after the baseline.
Slice length depends of Topspin skill : 0% => easy to get long slices ; 100% => hard. Maybe you changed it..?
I don't know but the slices are so short...and it's a rare case to get a deep one...my topspin is 0% always
I guess I use slice mostly when defending a bit behind the baseline but still the length is too short, making the slice too attackable (not any better than before the new version, it's even worse)...also I noticed several times I had to slice from inside the court and they weren't long either :/
Just before the morning update slice seemed fine - especially with the morning's reductions in speed and precision penalties on low balls, now it should be fine with the length as before...