[disoriented]

Just to keep this topic in the appropriate thread (something we should all do).
My new PA Extra MX likes to roll dramatically when I try to loop (& for the life of me I cannot remember which way). Jason had suggested I check the lateral balance. Have just done so but all it needed was 5 cents taped to the outside of the right wing.
I have also previously mentioned that when I glued the Horizontal Stab into the fuse, the glue cured in a manner that caused it to minimally not be horizontally parallel to the main wing.
Measured by "eye" only, there does not appear to be any warping in the horizontal stab or elevator.
Maybe I will have to do an elevator rudder mix, but will need si=ome programming help.
Anything I may have missed to check?

I suggest playing with the CG a bit. My old PA Bandit had a very narrow "happy" CG range - no more than a few millimetres. Aft of that, and it would be all over the place in a loop. Too far forward, and it rocked its wings in harriers.

When getting to know a new 3D plane, I think it's a good idea to start off with the design CG, and then experiment. A flight or two with the pack 2mm in front of design CG. Then, a flight or two 2mm behind. Then 4mm forward, aft, 6mm, 8mm... It becomes obvious how pack placement influences behavior of that particular airframe.