Thank you Nicehash! Now is much better. Probably this will be ported in the next 1.7.x.x version!?

My results:
PNY GTX 970 OC XLR8 - ~52 [1367/3506]
ASUS ROG GTX 1070 O8G - ~70 [2038/4101]
ASUS ROG GTX 1080 A8G - ~60 [2038/5003]