I made 3.1 BTX in 24h, with an average hashrate on 42MH/s reported by suprnova, but a constant 65Mh/s on the rig side

There might be a problem on my setup.
2 GTX 1080 + 2 GTX 1070
Clearly not profitable at least on my side, I make 10 $ a day with the same setup on ZEC with EWBF.
Ya that sounds a little low to me but I don't know what you have going on there.