Soooo... if I have more hashpower am I getting more difficult shares or what? :S

Hi guys, is it possible that I'm getting more shares with single gpu in my gaming rig than with two??
I've been mining zclassic with a 1070 on mining pool hub for a week now and was getting something like 2.3 shares per minute on average.
Yesterday I added a 1060 6gb on a riser and now I'm getting about 2.1 overall (1.4 with 1070 and 0.7 with 1060)...
I'm really confused... I've got shitty spc vero m1 600w psu, the workload is around 270w (became really noisy). Can it be the source of problem or maybe something related to dstm's miner?

I've been playing around with the clocks a bit, it seems to me that higher core clocks don't have any influence on the hashrate in my setup or maybe even reduce it... Besides the card was oc from the box so I figured I might as well reduce it a little bit just for the sake of slighlty smaller temp and power usage (I know it's probably pennies)

25.2 MH/s stable on claymore

1060 6gb armor ocv1 (msi)

Power limit: 60%
Core: -100
Memory: +1000
Fan: 65%
Temp: 55-57°C

~118W from the wall for the whole pc