Rick,
I have a GP Giles with a Moki 2.1. It's a monster! The Giles excels at rolling manuvers. It will 3D but has some limitations. Make sure that the CG is as far back as you're comfortable flying and that the wings and elevator are warp free! Don't take this for granted!
Anything will torque roll... Even my Cub did with a big motor. Excess power helps here because as soon as the plane starts to fall out the thrust collumn shifts and suddenly you're not hovering any more. You have to increase throttle when it falls out not only to maintain rudder authority but because the plane is moving backwards. If you hear the prop start to rip, the plane's falling backwards (cavitation of the prop), if it starts to spin quickly it's also falling backwards. You need to hit the throttle long enough to get straightened out, then back off to hover. Try some different props. We like Zingers on the 2.10, 1.8, 1.4 and 1.35 for 3D because they spin up fast and seem to torque better. (subjective opinion here, maybe they allow the engine to spool up into the torque band better than the APC's do...?)
Light weight is your best bet in 3D. The Giles is not light compared to the Cap and Edge but it will 3D. It's just not a forgiving, and will snap out if you are ham fisted at all.
Try mixing spoilerons and flaperons (elevator-spoiler and elevator-flap mixes) on a switch so that you can select between them and normal aileron function.
Spoilerons (up ailerons with up elevator) will help smooth out the wing rocking in harriers and elevators. I usually use high rates on everything and hold full up, jockey the throttle for attitude and altitude. Pay attention to the wings, usually they'll stop rocking with one more click of throttle.
Flaperons (down ailerons with up elevator) will help the plane "pop" in walls, suicides, and waterfalls. Get the plane into a hover, rock it on it's back a little bit, apply full down elevator and full throttle, and see what it does. Usually it'll do 3/4 of a waterfall and try to exit the side. I carry a little right rudder to keep it straight.
Blenders are a downward vertical roll for 2 rotations, then you slam opposite rudder-down elevatorand full throttle. As the plane flattens out you walk the ailerons over to keep it level. It's impressive when it works. The Giles is hell for stout, so you shouldn't have a problem with it coming apart, just manage the throttle.
If you've got any specific 3D questions just shoot me an email. [email protected]

Chris