If you need to dial down the reactiveness of your quadcopter throttle when you are flying in stabilize mode you can add some Expo to it. Expo makes throttle movements less aggressive at 50% throttle, but as you move further away from centre the rate increases still leaving you with full range of power.

Here’s a short video I shot on how program the Expo feature for your throttle channel on an Open9x programmed Turnigy 9x