I have 18 AMD rigs with 6x 580, all working flawlessly, same hashrate, 180mhs / 500mhs for lbry. or 5000 dcr.

Most of my pools are Suprnova, minerpool.net, should I avoid those? or some of those.
how to spot a shit pool, what to look for?

I'm mostly jumping between ETH, MUSIC, PIRL and sometime EXP.
while always staying with LBC.

those aren't that major jumps, shouldn't affect my mining by 35%, well I don't think so.