Pilot trim is much different than aircraft trim. Aircraft and helicopter trims are set by the maintenance pilot, so it is different. It is a bit like trimming the rod ends during the maiden flight wringout. Pilot trim in scale aircraft is mostly dependent upon load cg, performance settings, and weather.

I have some reference about trimming at full throttle, but I forgot where that is at the moment. I just don't know enough to say either way is best.

Having flown both analog and digital trim radios I prefer digital. Set it and forget it.