I'm in the same boat as you. 3 card 1080 Ti only returns about 5 mBTC per day recently.
Try editing your start.bat file and change "interval" from 90 to 1800
Thanks for sharing. I'm gonna give it another 24 hours. Setting the interval to 900 now. We'll see.
If not better tomorrow I'll go back to NH.
This is pure conjecture because neither 900 interval nor 1800 interval were tested, but I think you will find better results with intervals at either 1800 or 3000. 900 interval is too close to 600 interval for me to recommend:
Order of earnings: Highest to Lowest for past 23hours
3000
6000
Default
600
36000
If you do find good results at 900, that will be a breakthrough and will buck the trend (first 13 hours had 6000 interval at best performance, @ 23 hours, 3000 had passed 6000 for best performance).
I'm testing today @ 1800 interval, then tomorrow @ 3000 interval.