In the second pic from the left on the bottom, it looks like the top wing is significantly twisted. The sideways pic on the top left also looks that way since more of the checkerboard shows on one side than the other. That would cause the problem you are describing. You should be able to fix it by twisting the wing while hitting it with a heat gun. It really helps to have an extra set of hands for that.

Lateral balance usually shows up under significant G loading, such as pulling out of a dive. You'll see the plane drop a wing on the heavy side when you pull the elevator.