each plane has different characteristics, I generally spend way too much time setting up planes to be as close to neutral in a hover as possible, and adjusting trust angle is a large part of it. most of my profiles don't need uptrust, they ussually hang pretty well, however on the h9 cap i put in about 1/2" uptrust to make plane very neutral. its a pain, but keep making small adjustments and you will find a sweet spot where the plane will hover w/ very little inputs