1- if you play with Sam Patch, that means a lot of people helped your TE experience to be the best !
2- I played a couple hours TS2 ; I have the (blur) memory it was not possible to aim for the line without doing a risk shot, but maybe I mistake it with other ones of the series.
Anyway, you can aim for the line in TE, just get your timing perfect ; it'll always be hard aim perfectly, though, but this is realistic
3- players always sprint like crazy, whatever the situation is (with 100% speed, they'd be on par with best 100m sprinters)
4- stats change every year ; you may try to tune them by yourself if you want to, though
5- for gameplay balance, higher topspin slows the acceleration down ; but you get more effective short acceleration (from the better topsin), so when you play as Nadal, use it when you see your opponent is far from his baseline, you should be able to do some winners
Note: it's not recommended to play with fast AutoPos, and without preview, you might have a hard time to do the most effective shots (ie: the acceleration & short acceleration)