SCHLIRi,
1) I didn't get any email from you. I got your message post from the webform though. Could you post the link to mediafire in this topic ?
2) I think your player's serve + stamina & speed skills are too low, while your volley skills are too high (he's a powerbaseliner, so he doesn't need them much).
Everything else is very good, but if you didn't hire specialist trainers, do it now, it'll help you a good deal..!
Algo,
1) Current Reputation levels are :
Very Low
Low
Medium
High
Very High
But it's comestic only. Calculations are done with its actual numerical value.
I don't want to put too much emphasis on this level because to get the best reputation possible you need to coach 4 top players, and that may become a burden for the average user...

2) When you're a junior, Potentials can high while your skills are still relatively low, which would be like Isner and co.
However, in Incredible, it might be impossible to get top potentials. Could you show me a picture of your players with his potentials ? Did you notice a high Motivation helps to train better ?
3) Thanks for your order ! But don't buy TE4, you'll get it for free as long time Tour Mod..!

4) If you want to try out the ball physics change for TE4, then turn on the DevMode in TEM2, right-click in the Main menu and then access the hidden Training Club..!

(play in Warmup, in match it might have too much balls ending in the net to be enjoyable

)