$0.06 per kwh and you can't find a profitable coin for mining?
I'm paying $0.22 per kwh and i'm still mining, my rig has low net profit per day because my electricity is very expensive, but i can profit about $4 per day(bitcoin at $6500).
Anyway you can mine and hold some months until bull market comes.
You are doing it wrong, in your case is all about trading, selling/buying coins.
Anyway, if the rx 480/580 was still selling for $180 then the roi would be around 300 days. 2 years ago btc was $200 and eth was $7, roi was 300 days, now btc is $6700 and eth $490 and roi is 700 days, it is all a huge mess, mining was never this bad since March 2015.