I cannot add any deep thoughts other than we call Caps 21 , 232, whatevers. SNAP 21's, 232, etc.

I have a WM 232 Cap and it too has a snap hiding inside. Go too slow or downwind, don't have the wing level and pull hard up it rolls the other way like I had commanded it.

Try to do the same loop the same way into the wind nice and easy till you can determne if it always goes to the same side or not.

If so then you maybe able to adjust the eleavators halfs or add a little tip weight to the opposite side and try again.

Try tapeing large coins to the underside of the wing at the tip. I use 2 quarters on the left wing tip of the red plane you see in my avator