I have been learning to hover my BCP with the throttle trim set at the lowest setting. I would recommend that you set you throttle trim at the lowest setting that allows you too hover (on a fully charged batt.) at about half throttle and leave it there while you learn. Changing the throttle trim often requires a change in the other trim settings (as well as the gyro and mixer settings) which just makes things more complicated for me. Keeping the throttle trim at a "fixed" position allows me to spend more time hovering and less time making trim adjustments. This is just my 0.02 worth.