The past week or so the estimates for my rigs on Nanopool have gone down quite a bit. I've been getting estimates ranging from 0.65 to 0.72 ETH per week. Now it is struggling to give me an estimate above 0.60 ETH per week. I have about 1.3 GH/s hashing power. The difficulty could not have gone up this much in 1 week?? I might switch over to Ethermine for a while. Tests by others have shown it outperform Nanopool. Anyone else notice this?