Elio & C4ill gave you the best advice, play with the community, you can still join the chat and play only friendlies if you feel not ready to play the Tour. Then you'll see that human beings doesn't reach your power shots as consistently as the CPU does

The CPU has almost always a better defense, and doesn't get wrongfooted as much as humans.
By the way i use mostly power shots and top spin shots, sometimes b1 short crosses.
Also if you get out a lot out using accelerations (whatever you call it b1+b2 is called accelerations in TE), it may be tied to your controller ?
i would'nt advise to use joypad analog sticks, but it's just me. i think it's better with TE use a digital pad if you have one. And moreover i think the keyboard is the easyest controller to get fast improvements with TE.