Been mining at "opc.hashhot.com/" for a little over a half hour, no coins have shown up yet. Is this normal for this coin or should I consider moving to dif pool?
http://opc.pool.mn/ very good

I confirm, that's the one I choosed too and it's working well

Yep, they are working great. Don't mine this coin at "opc.hashhot.com", I mined with them earlier for about 45 minutes and still nothing in my account there!
I tried this one at first and it was taking into account only like 1/3 of my hashrate so I switched to opc.pool.mn