I just want to warn you before, I'm making some test in the meantime cause I think I've found my main problem by myself, but I'll still share it with you in case someone has to say something else about it.
When I'm mining CCMiner 2.0, I get around 49 MH at 85% power on my ''good'' evga cards. The problem is, the hashrate and gains I make with it are
inferior than when I use CCminer 1.7.xx
CCMiner 2.0 = Bigger local hashrate, less hashrate at the pool and less gains.
CCminer 1.7 = I get about 39-40 MH instead of my ccminer 2.0 49 MH, but I have a stable hashrate at pool, and a stable mining income.
( Yeah, I don't understand either, but would like to )
I'll continue my test further tomorrow after 2 days of mining with CCminer 1.7.xx then turn my miners back to CCminer 2.0
This is for
Myriad-Groestl mining
In the meantime, Can't wait to get my other pci-e Riser, as I've started to shop for another 6 gpu rig

I also notice this issue. At some ccminer version (or mod version), I can see nice local hashrate, but unstable hashrate at pool, but some version with less local hashrate but stable pool hashrate.
Please do test further and update us the result. Thanks!