dont really get how do you get 500 ~ h/s def fee ? I mean you monitor the address you found ? How did you find it ? Also your local hashrate is 1550 and this is exactly shown on f2pool graph for your miner. How does there is 10% fee if you get the correct hashrate you are shown on your local computer ? Only way to do this is if cards hash at arround 350 ~ and miner shows 250 ~ (hides another 100 to transfer to other address) . But looking to other people everyone seems to get arround 250-260 from 1060 3gb.
edit. I just tried v3 of uupool miner and it has really 20 % decrease in performance.
I have no idea , It's really strange ... But I know there is only one devfee address and the miner do not mine more than 1 min every 10 min (injected DLL from Demion/nodevfee)
Difference is not that huge (use average 24h) but still more than 10%. It may come from the pool.