We run on carpet with medium grip. It's not so much the carpet as it is the very stiff diffs and level of competition. The oil filled diffs with 500,000-2.5M weight oil are great out of a corner, but destroy tires. Our races are such that anything short of perfect tread won't cut it. The silly torque from brushless power only encourages wheel spin.
We run Orca Q 2200kv spec motors. Basically the same thing as Hobbywing 13T, just slower.