First thing
I would check is to take the steering linkage loose and make sure the column or the u joints are not binding...as in the bushings in the column are not too tight. I would drive it first and get it hot, make sure the wheel is not unwinding out of a turn.
I would also check to see if the outer tie rods are not binding on the steering arms.
If that is not the problem, it must be in the rack. Have you called DSE to discuss the problem?
Good thing is it can only be a couple of things and should be easy to diagnose pretty quickly.
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