[BrianG]

You used copper heatsinks, which you are right does transfer heat better, but on plastic? Plastic is an insulator IIRC. I'm surprised the heatsink, copper or otherwise, made any difference at all. I suspect the biggest difference came with using that fan. If you flip the ESC and install those copper buggers on the aluminum case, I bet you won't even need the fan as long as there is adequate airflow for the heatsinks to work. I only used aluminum because I already had it on hand and copper tends to tarnish easier reducing its effectiveness.

I've been eyeing that eagletree unit for some time now. Sounds like it works very well. Handy to have around.