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Looks like xmr-stak or xmrig does not get me the same hashrate that I have with claymore xmr. Claymore gives me 4950 per rig and xmrig gets me 3800-3900 with the same overclocking settings on SMOS.
It's odd..
For now I'm sticking with ethermine, not a big earn but hoping the price will go up in a few months..
You might want to give SRBMiner a try. I am getting nearly the same hashrate and just slightly more power consumption than xmr-stak 2.5.1 was doing on CNv7, and way better on both parameters than it did on CNv8. ANN thread is here in the mining section and fairly active.