QuintLeo,
Have you what OC settings are you running on your 1070ti rig? I am following your original posted settings of 108w/+200 core/+700 mem. I am getting 4.4 Sol/w avg. on DSTM 5.7 in SMOS.
Original post was actually 106 watts - all of my 1070 ti cards right now are set in the 104-106 range to allow the rig to hit my "6 amp draw" target.
Anywhere from 100 to 110 watts has given very similar efficiency, though 104 *seems* to be the sweet spot by a hair.
+200 +700 has stood up so far as "best" for the clock settings - higher = unstable rig, lower loses a little hashrate.
Keep in mind that my sample size is still pretty small - a few EVGA SC models and one Zotec Mini, though I DID just get a MSI Turbo card in that will be going into my next "rig rebuild" project probably tomorrow.
To be picky, none of my rigs at this point are "pure" 1070 ti rigs - I've been converting existing rigs and using those cards IN ADDITION TO the small number of 1070 ti cards I've been able to get to date (just managed to sneak in an order for an ASUS blower card in on Newegg today).
(edit)
make that +200 +1400 for LINUX usage, recent testing has shown that LINUX works with "effective" clock rates on memory where Afterburner works with "base" clock rates.
Still don't have any "pure" 1070 ti rigs yet, but I'm getting closer as I work through my "reconfigure" project.