I'm not sure if I'm doing something wrong or what, but when I benchmark x16r on my 1080 I get 32MH/s with RavenMiner and 26MH/s on CCMiner - however when I actually start mining on ZergPool it gets 13MH/s on both.

Same problem with my mining cluster of 970's - 17MH/s when benchmarking, but 4.5MH/s when mining.