I tried a 24 hour test with 12x 1070's and found the following.

1) The software reported hashrate is considerably higher than EWBF, around 500 sols faster with same clock/power settings, that is combined over 12 gpu's.

2) The reported hashrate seems to be higher as well, however, the accepted shares seems exactly the same on Mining Pool Hub.

3) Bminer seems to have more rejected shares, not a lot, usually below 1% but at times it was higher. Running fairly moderate O/C settings, rig 1 is +75 core / +400 mem, rig 2 is +150 core / +500 mem, about the same amount of rejected shares for each rig. Also tried with stock settings and had about the same amount of rejected shares.

So I'm a bit confused, I'm going to try again to compare over a longer period, but for now I'm back to EWBF. Btw, Devfee was enabled for both miners during test.