Re: Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v14.1 (Windows/Linux)
At my point of view, dual is not profitable, or the same as mono, except free socket. In my case mono mode takes apr. 800w for 6 cards RX480 and dual mode takes apr. 1050w.
you are mining the wrong dual than 
do you have tried ZIL in "custom" dual?
give a try and you'll see the positive results