I was talking with the owner of Windtunnel racing, they do graphite and fiberglass rc parts. He says he can make tbars in custom sizes, like .078, .080, etc, which would actually be the size, unlike most of the stuff available now. Usually an .075 package t bar can be from .070 to .078, and you have to look a long time to find a thick one. So maybe you guys could post what size you would want for carpet. i'm thinking if you could get like .078s all day that would be cool. Or even thicker for real high traction.
website:
http://windtunnelracing.homestead.com/associated.html