Even with the 4600 on 2s geared low, temps get too high for me (over 150*). Despite its small size, the CRT.5 is fairly heavy. And it's 4wd (greater load). A 3s setup on a ~3500 kv motor would be best IMO. Temps will be much better all the way around.
So far so good! The Medusa motor seems to be a good high quality motor. There seems to be more metal to it compared to the mamba. :) using the stock spur and a 14t pinion, the motor barely gets warm. The esc was getting a little warmer than i woulda liked, but i think a small fan will keep that in check. This thing is a riot!