So what did you end up with?
It does sound like a weight transfer problem. The car wants to squat too much on-power and release it all of a sudden off-power causing oversteer. I had the same problem on carpet a few weeks ago. I solved the problem with a softer front spring. I could have used a stiffer rear, as well.
MM3 also tends to work better on carpet. You don't need the rearward weight shift of MM4 to get traction and it makes the car more neutral to drive.
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