O.K., Well, outwardly I can see nothing wrong with the chassis. It still favors one side to the other, huh? Have you checked out the front diff? Therecould be something gumming up the works in there, causing it to favor one side to the other, though that is a long shot. I'd still check it.

Other than that, go through the front end, and make sure all adjustments are the exact same, left and right. Put some weight on the front bumper, too. That will help immensely by balancing the front / rear weight bias. 3 Oz. to 3 1/2 Oz. to start will be good.

Does the steering have slop in it? The Sprint 2 is notorious for steering slop, and since the RS4 is where the Sprint 2 came from, that could be contributing to the steering problem, too.

Let us know, after those checks, if it still favors one side to the other.