I go with Javven's advice. It's easy to do a loop, but try doing 3 loops... one after the other... Exactly on top of the one before. In other words, if you were leaving a smoke trail, 3 loops would show up as one ring of smoke.

Try making your stunts with precision. Start out straight and level, go into a stall turn, then pull out at the exact same height that you entered from.

Precision adds a whole new dimension to aerobatics.