To comment on something the original poster asked about...you cannot get a model to be "hands free" in all flight regimes. If the model will fly hands free in upright, level flight, you will not be able to fly hands free when in inverted, level flight. The same would be for uplines and downlines, regardless of the angle. The fact that the wing will almost always have a symmetrical airfoil precludes it from being trimmed such that it generates lift in all attitudes without pilot intervention. Hands-off upright flight means that you will still have to apply some elevator when inverted.

Even with a well-designed, excellently-trimmed model, you'll likely find that inside loops or snaps will take different amounts of elevator deflection than outside loops or snaps. The same with left-right maneuvers. It's all very, very complex. The best one can hope for is a model that responds the way you feel comfortable and that performs the maneuvers to the precision you're trying to get. Someone else will take the same model and wind up re-trimming the whole thing to suit them.