I own a gigabyte G1 1080, and i think their cooling system is correct but not enough for the 1080... at least with current july temperatures. Consider the Extreme if you buy one...

But could be different on the 1070 if they use the exact same cooling system, less cores to power = less heat...

Else about yiimp fees, the 1% is temporary, because its less than that (all tx fees are included in it). If i get too much miners, i may have to increase it. (On suprnova they take some fixed amount on each payout)