Go to my blog and find the post about carpet techniques. It was written by Mark Brown many moons ago, but should give you a starting point.

I should warn you that the setup was not built around our current TCS spec tires, and you will have to do some testing of your own to find out what works and what doesn't. Like Orlando and the rest have said, it's a feel thing that is different for every driver. I've yet to master mini's on carpet, but the setup guide should give you a bit to work with.

(Link to my blog is in my signature, just copy and paste....)