All airplanes that are longitudinally stable will behave as you describe. The first step should be to check the location of the cg. The more forward the cg, the more pronounced the “ballooning” behavior. As the cg is moved rearward, the pitch up tendency with added power becomes less until a point will be reached where it no longer pitches up with added throttle. This is the neutral point and while most aerobatic airplanes are balanced close to this point, they require constant attention and skillful thumbs to fly. If the model is built according to the plans you shouldn’t have to mess around with incidence thrust line, controls, etc. Just move the cg rearward until it flies like you want it.