I'd ike to see the R1Pro mods you are working on. I agree that it is the better controller of the bunch. At least from a drivers perspective. Its very smooth and very small. I have already considered opening mine up and installing my own heat sinks. Even still I hace run the R1Pro very sucessfully in a 1.8 buggy on 5s without need for additional cooling. However I was concouis of the size and lack of heatsink so I set up a fairly mild system on it. It was still more than enough power for the track though, but I could see some anting more than I had running on it. I'm sure it could take more also, I just havent pushed my luck with it yet.
If you come up with a mod for it, let me know. Id be happy to send you mine and be a beta tester for you.