Use the P2 assist software and goto advance > gimbal. Here you will find GAIN, VERTICAL and HORIZONTAL.Do you sometimes find the propellers in your shot? I find that when I think I'm reversing. Maybe no way around that.
My mind is a little hazy as I haven't flown the P2 in ages, but if I recall..
Setting Vertical(maybe horizontal) to 10 will limit the looking up range and prevent props in the shot. I think if you set to neg 30, it can look into the sky.
And the Gain wont change anything.