I, too, would like some advice with this, especially since I'm one of those stupid fools who attempts to kill tanks with high-angle rear attacks with 20mm cannons. (I think there's a few tanks and certainly most of the light armor that have vulnerable roof and deck armor, right?) This requires pin-point accuracy that I'm usually lacking.
What do you all think of dropping a few notches of flaps and flooring the engine to let yourself keep your nose on the target while not losing too much alt? It seems to work okay, but on the other hand you're painting a huge target on your fanny that says "blew all my E, please rape me."