FMS Giant J-3 Cub (1400mm) help

[BBCorvette18]

Hi everyone I recently purchased the FMS Giant cub in RTR fashion from Banana hobby. Was fairly easy to put together once I decided that the instructions weren't worth looking at other then getting the correct screws.

anyway fast forward to putting it in the air. I put the bird in the air and it seemed to be really twitchy. part of this I'm sure is me as I haven't flown a RC plane in years but prior to this cub I put a 1000mm Corsair in the air and was flying pretty good. Anyway from my research I think the plane is a bit tail heavy.

Now to my real question. Which has me baffled. I put the plane into a full powered steep climb then right before stall give full up elevator(back on the control) and full right Aileron (bottom right corner of joystick) and the plane does a nice "snap roll" (probably not the proper term). Now if I do the same thing to the left. Full up elevator and Left aileron the plane starts to roll to the left and then stops and just does a bit of an off axis loop. It will not roll to the left like it does the right.

So my question is why? does anyone have any idea why its doing that. During normal flight the plane turns (rolls) to each side just fine. On the shop floor the throws are equal from side to side.

The only thing I can think is it might have something to do with the thrust angle of the motor??

anyway sorry for the long post and thanks for your time reading and or replying