The 1070 and 1070 Ti's aren't exactly hashing powerhouses the more you overclock them
What they do exceed at is in efficiency! Underclock the power a bit and put the core clock around +125 and memory clock near +700 and you'll get an all around strong hashing power as well as an efficient hashing-to-wattage ratio or Sol/s
That is why the title is "tweaking" and not overclocking

Do you have a guide for this process you mentioned?
Ok then search the forum or use google to find out what underpower and overclock settings people are using with whatever algo you're using on 1070's. If you're deselecting all but one in NH, then you'll be able to dial it in better.
Thanks for that but I was looking more for a guide rather than just copying what others have done; copying may give me better results than stock but I don't know which one really did what and why each has to be set at a certain level.