Its not ethermine, im on nanopool and its getting worse by the day, but the fault is from Claymore. I had almost same average hashrate like the reported, in many days even more, for weeks, with 10 to 10.6, but i was a fuckin idiot and changed to this shit 11.5 and i get 5 to 9 less mhs than reported... Its utterly and absolutly garbage. I will go back to 10.6...