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No I am not sure. I am speculating based on all the information you have provided.
Try this. On an open road where you have plenty of clearance and space and no other cars around, put the car in Sport plus and turn off all the nannies. You do this by holding the DSC button down for about 5 seconds until the "DSC Off" illuminates in the gauge cluster. Then go for it. With an open rear differential and no DSC or DTC to intervene, all you should do is burn rubber. The rear end will certainly want to come around (usually to the right) requiring steering input to correct. But the sensation should be of controlled oversteer, not an instability or "wobble" as you called it.
Based on my experience and automotive knowledge, it just seems unlikely that a little more torque would "overpower" the rear suspension and differential. It seems more likely that the TMC unit is messing up the electronics in your car. Then again, just my opinion. I could be wrong.
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