That much aileron trim suggests more than a lateral imbalance. And if it were a weight imbalance problem, it would show up as needing less aileron trim with higher speed. The weight doesn't change but the aileron trim gives lots more effect with more speed. With warps that can be trimmed out, the warp and the trim are basically working with the same airspeed and somewhat cancel out.

Can you take a digital picture from directly behind the airplane?

Keep in mind that the airplane could have been trying to roll with both wheels on the ground and one was against the runway, stopping the roll from happening.