I have a question about the rise or pounce on take off. It was drilled into me when I got started at contests and was asked to launch some pretty nice models, that you don't hold a model down at launch, you hold it back. One hand cupped around the leading edge with the thunb on top for the engine start, and the other hand around the opposite stab leading edge. Once the engine is started and needle set, you should just be holding the model back. In a three point stance and a positive angle of attack, it shouldn't be forcing itself down. At the pilot's command, just flex your fingers and off she goes. I have seen models bounce a bit on release, but it's usually caused by the pit man and his method of release. That, and don't have it pointing too far out of the circle.
Type at you later,
Dan McEntee