Hi Ocminer,
I m using ccminer 2.0 on an gtx 1080 with myr-gr algorithm on dgbg.suprnova.cc.

I ve mined for few hours yesterday, and also the results are very poor ( about 30% coins productivity ). On other pools still not 100% but close to 80%. 


Your pool , after about 20 minutes shows at max less then half hashrate. On other topics i found that may be something wrong with the difficulty settings from the pool.
I tried on ccminer -f 2 , -m 2 , and other numbers  as diff  multipliers but still no improvement.

The week before i have used sgminer on few amd cards, works well about 80% from expected.

Right now i m on other pool , but i ll be glad to come back, once is fixed .

Thanks.