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With all the work you've done, swapping in a BBK front and rear, m3 control arms, poly bushings etc, is where I would start. Something that is rotating is not rotating correctly. Get it up on the lift and give it some gas, check the rear wheels while they are up in the air for an abnormal movement. Check the wheel bearings.
It could also be that the poly RTABs are just that stiff and transfer every road imperfection into the steering wheel. Without a video, it's hard to tell how bad the problem is.
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11 Z4 35i | 08 911 Turbo | 02 MB E55 AMG | 01 M Roadster | 98 MB SL600 | 92 850i ACS
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