Can you make the same diameter turn both left and right?
Test that in a small cul-de-sac by reversing the direction of the turn around.
I had that problem with an AD with aftermarket power steering. It had an adjustable drag link so I could even it out by adjusting the length of the drag link.
Is your steering box adjusted so that there is a tight spot in the steering wheel while the tires are in the straight ahead position with the drag link disconnected? I do not know if this tight spot not being in the straight ahead position will cause your issue, but it is something which is important to have right regardless.
