It sounds like you are breaking traction and the DSC is kicking in and out. Don't forget that it takes about 200 miles to properly scuff in new tires - hopefully things will improve after the break in, but you will still have to modulate your throttle inputs with 300 ft lbs of torque.
I had the non RFT M3s on an E46 and they were quite stable for a winter tire.
Tom
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