I beg to differ with Jaka, most models have a built in right thrust and down thrust although a very few do not. Since the contender has its wing center of drag line near the center of of gravity, it will require less down thrust than a high wing or shoulder wing model does. From your description of the increasing pitch up with added power, I'd almost bet your problem is not enough down thrust: you may even have inadvertently built in some up thrust. I like to trim all my models out so that, with increasing throttle, only speed increases-not climb rate. This means careful adjustment of thrust line although you sometimes also have to adjust the relative incidence between wing and stab.