RE: Why is it doing this
Hi Rich.
They ain't the easiest models to fly at the best of times......
It sounds like either the towhook is in the wrong place, compared to where you've set the C/G.
As for it wanting to turn one way...........either the wing is heavier on one side, or you've built a warp into the wing whilst building it.
I hope this helps ?.
Cheers,
Steve.