I would not have bought RX480s, they're not really more powerful than the RX470s.
That said, I think ZEC will go back up once they fix their z wallet bug. Also, it's still more profitable to mine than ETH for the moment...
no, it is not.
Uhm, yes, it is. I have 3 rigs total, 1172W @ wall for 490S/s. That's almost 24$ a day of profit. No way I can achieve this with ETH.
I use something like 20% less power on the same rig for ZEC.
It seems your rig can do 2.39W/Sol/s. For most rigs, they can only do 3W/S or more. What is your setup?
"Heavy" undervolt

1st rig: 4x RX470 8Gb Nitro+ core 1100/mem 2000, 1500 timing strap and a -137.5mV offset
2nd rig: 4x RX470 4Gb Nitro+ same configuration (2x Elpidas, 2x Hynix)
3rd rig: 2x R390X, just modded with hawai bios editor. I stopped using them with ETH, but with ZEC and the latest claymore, they give me 55S/s each. Can't recall the exact config I put on though, would need to check their bios.
As for profitability, My 2 RX470 rigs would pull out around 114Mh/s each for 530W @ wall. With 228Mh/s, I would mine about 1.5 Eths a day according to
https://www.cryptocompare.com/mining/calculator/eth, even with the current difficulty of ETH which has lowered with everybody mining ZEC.