My first guess would be the wing halves being joined slightly out of alignment, such that the right wing is flying at a slightly high AOA than the left. Not a wing "warp", both sides could be perfectly straight, just joined together slightly off. It doesn't take much. If you have an incidence meter, or know somene who does, I'd say check the root and tip of both wings, all 4 should be the same, or at least match in left-right pairs if the wing has washout in it. Do the same with the horizonal stab. The vertical stab could be off, but frankly, that doesn't usually affect things THAT much unless its WAY off.