Heathy, One of the problems with the heat from the amp, is that it is class AB which many will tell you that this class is far better for sound than any other practical class, I exclude class A. I'm about to put fans in my rack to help the situation. If you are referring to the amp at the shootout, it may be that it was the un-modified version that was the original starting point for my amp. My amp was fixed so that it was slightly less power, but 35% better on the heat situation. My current amp produces 3.5K into 4 ohms per side minimum.
The reason I'm joining in here is to say that if you want to try the amp, you can.