I find it very unlikely that the plane is so out of balance laterally that you can't trim the tendency to turn out of it. I'm guessing that there's something more drastic causing it, like the horizontal stab not being in line with the wing, or the vertical stab not being in line with the fuselage.

I'm also guessing that if this is the case, that laterally balancing won't help.

Hope I'm wrong, and welcome to RCU!
Dennis-