Have you measured the distance between your hubs front to back to ensure they're evenly spaced?
It was almost impossible to get my older JGC to track straight, and it turned out that one side was just wore or adjusted so poorly that the wheelbase was about an inch shorter on one side.
I would check the play in your rear axle too, it's where the main driving thrust is provided, and if it's jimmying to one side under power it will cause you to veer.
Generally, torque steer is more noticable on FWD cars, and is typically caused because the centerline of tire, is not the same as the centerline where the front wheels pivot when turning. A tire on one side will have more traction, and thus cause the tire to pivot the whole steering system when under stronger acceleration.
03 WJ Limited, 04 Overland