1. No idea why... Maybe coz you modded the game... Be sure to play with the latest version as well ; in case you changed the CPU serve speed, earlier version was also changing yours.
Or it's coz you don't know that women serve slower than men ? In Training Club they serve at same speed than men coz it needs to be fair against men while playing online.
If you want faster serves, you can edit the Tennis.ini, under [WT_Static], raise :
WtaServeSpeed = 0.85
2. If you want the CPU to run more, give him more time to run before you hit the ball ... What difficulty are you playing with ?
3. You're playing with a Mod that brings bugs, don't report them to me...