I haven't yet bought an ARF or kit where I have ended up with the CG within the range recomended by the manufacturer, I always end up behind. EG my Fliton infinity 90 I was finally happy when it was a whole inch behind the recomended point. I have heard that too forward a CG will cause snapping problems on planes like this. The extra weight of such a big engine won't help either.

As mentioned above, check all the angles, stab to rudder, wing to stab. I have found these are often out when I build the planes, and have to put in a fair amount of work to make sure they are straight.

I'm glad someone has success with this plane, as I really like the look of it, and I am thinking of getting one for the winter, so that I don't have to get out my big 120/140 size planes when it is cold and muddy.