Please pardon my lack of knowledge here,

I'm a full scale pilot with just a little aerobatic training in a super decathalon. I was under the impression that stalling the wing was a prerequisite for snap roll.

How do you do a snap roll with no elevator?

The ones I've done were with full aft elevator and rudder in the direction or roll with no aileron used at all as I recall.

I've only done level positive snaps and avalanches ( if you can call mine that, heading control is weak, like 30 degrees off)

I've noticed the models enter a little better with some aileron to kick them off and needed none once established.

Les