Hello,
No workaround yet for Nvidia 1070? from 32-33 the speed dropped to 25-26.
I remember years ago when we started with this mining it was an issue for AMD cards but still RX 580 performance is ~ 30-31, way better than Nvidia

.
Thanks
Try to set parameter
-eres 1
if will not work, then
-eres 0
It helped for me. Look at my messages before in this thread
I try this, not help me. I have always 29,8MH on gtx 1070, before I have 32MH,