RE: Aircraft rolls with up elevator
I've not been able to find where you identify the model. What is the airplane?
When a model snaps out of a loop, it's time to do some judging of the speed and sharpness of the loop.
Almost any will snap out if they slow enough and you don't ease up on the elevator. And if you're trying to force too tight a loop, some will snap out when they've had enough of your pushing.
And almost every model of an aerobatic fullscale will have a very strong inclination to snap out of loops until you've tuned your elevator throws. Tapered wing airplanes especially like to snap out. That's why Edge, Extra, Sukhoi, Yak, Cap and the like fullscales were designed with significantly tapered wing planforms. So they will do the snap maneuvers and the tumbles and such that are part of their competitions. And our semi-scale models of them repeat that behavior really good.
There are a lot of threads filled with the elevator tuning that lots of experienced flyers do to their snap-capable models. It's basically to fly and try. Each flight tries with less elevator throw until the airplane stops snapping out of loops it shouldn't snap out of. And then the modeler puts back the last bit of throw he just removed, and uses the final setting in the airplane for his High Rate Elevator setting. And sets the Low Rate so the deflection won't trigger that snap. And then has good control over a better flying model. The model no longer has excessive, wasted elevator throw that only made the model twitchy and risky to fly.