I think the counter style(counter style+about 100% in counter) may be slightly too good compared to some others styles...not by much but I think it could use some balancing.
Firstly because you can take the ball quite early, you will not lose that much power compared to "power baseliner" style for example, on top of this you don't hit errors and you have unlimited accelerations. This alone I think is too good
Also what might be unbalanced is the fact that as counter you don't need stamina, so you can use that huge amount of points to other skills without losing any advantage. For example you can have great lob, great dropshot and great volleys, powerful baseline game and serve all at the same time.
I think there needs to be more cons to this style