LUL 4 psu for one rig. You should have just bought a more powerful psu.
I have 14 1080 Ti, v2.0.5 has been running fine. I have 7 1080 Ti on one Corsair 1500 watt psu.
Go buy a Kill-A-Watt so you can measure the actual wattage from the wall.
7 - 1080 Ti @ 70% TDP = 1400 watts
@ 100% TDP = 2200 watts
Make sure your house has 20 amp circuit before running it at 100%.
Did you try any other multi algo programs or maybe Dual Claymore? (Let's not talk about NiceHash)
I'd think that many ti's would be able to do well on Dual Claymore ETH + SIA maybe.