Any of you guys have a 8-10% difference between effective current hashrate and current hashrate ?

I’m using pheonixminer on ethermine .

Yes, I had a lot of stale shares with pheonixminer. So I switched to Trex and the problem disappeared. I'm using Nanopool.

Tried Trex and same issue . Current hashrate keeps fluctuating but my 1070 rig is constant 100% of the time

Try lolminer with the fix clock... https://github.com/Lolliedieb/lolMiner-releases/wiki/Fix-Clock-Nvidia-for-Cuda-(English) That could help to reduce the temperature... if stilll fluctuating... reduce the core it will also reduce the Mhs but at one point will be fix hashing.