I recently converted to brushed, yes brushed, separates along with a gy240.
The esc's do not even get warm on 6 minute hovers (with a little vertical climbing and some rudamentary FF). The ESCs are sized as: 25 amp-main, 12 amp-tail.

However the stock MAIN motor does seem to be getting warmer that before when using the 3 in 1 board. I first though maybe it was pinion/gear spacing (binding, backlash, etc.) but experimentation eliminated that.

It could be a coincidence in that the main motor may be failing and is now getting hotter (it has 300+ 5-6 min. flights on it) or the ESC is somehow more efficient at power transfer but that doesn't pass the common sense test.

The batteries, 11.1v, 910 maH, get slightly warm with the battery charger indicating the 6 min. flights are consuming about 650-700maH or about 75% capacity.

Maybe I have too much pitch for the throttle setting causing excessive loading. As soon as these hurricanes pass and the wind settles down I will do some experimenting with that.