Hmm well I'll be waiting to see the reply to this question. I have been wondering about strapping some aluminum oil filter heatsinks onto the CIM motors for cooling. And turning it down or sanding off the paint would certainly help with thermal conductivity.
http://www.jcwhitney.com/autoparts/P.../p-298/c-10101
Between those and a 120mm fan by each transmission, that should help keep the CIMs cool