don't mess with the airframe....
Max out the throws and start fin tuniing your manuvers. Its surprising how aerobatic trainers are.
Slow down berfore a manuver then add power to "blast" the surface with air.
Take-off at slower speeds. perfect sloow landins. flat turns. One wheel landings. tail slides are cool with trainers. Flat spins are possible.
Heck I love getting a trainer every now and then. especally from those who give them away to move on. They come back and ask is that mine?
besides if you MAster all you can do with a trainer, your much better off with the next plane.