I have flown the large scale aerobatic models in AF5 including the Extra, Edge, and Katana ("competition" type, not "standard") and they seem to hold well in all 3D maneuvers including walls, and transitions into hovering without dropping a wing. With a proper entry speed and by smoothening out your throws with expo, it should be fine. BTW, I'm using my own programmable radio and not the gamecommander. I find it much easier to tune the throws, dual rates, expos on my radio.

Having said that, the large 3D models ("competition" types) are set up to fly differently from the ones in AFPD and they do have a slightly higher tendency to snap. The planes in AFPD were "too soft" according to competition pilots, so the AF5 developers gave the "competition" models an earlier stall behaviour in AF5. This especially improved the snaps. Anyhow, this stall behavior is unexpected for the beginner pilots (often mistaken for some 'aileron input' in a tight loop or very slow approach). So for beginner pilots, the "standard" models are recommended. For each model you can select either the "competition" or "standard" model type in the load model menu.

You can reduce the snap tendency by editing the model but I would do this as a last resort: go to the model editor and adjust the lift curve for both the AirfoilTip and AirfoilRoot. Increase the AttachedRange and StallRange, and reduce Cl0 to make the 'hump' in the green lift curve smaller. This will make the stall softer or even non-existent, and going into the wall or harrier is just as easy as pulling the the stick back. Compare these parameters in the "competition" and "standard" models and you'll see the differences.