Actually, the models response is a desirable trait. Learning to fly, and most scale types, full size as well, do this. It means that, to climb you simply add power, and to descend, throttle back. No elevator or trim changes need to be made, and come landing, when you need throttle to control the rate of descent and elevator to control the airspeed, then it all works properly. If, as a student this is learnt early then all landings/circuits with any model type become much easier. Leave well enough alone, and let the 'experts' modify their own models.
Evan, WB #12.