https://www.reddit.com/r/gpumining/comments/ixu7l4/why_is_my_1070_hashrate_so_slow/
GTX 1060-1080 video cards could mine without losing hashrate if Nvidia released a patch, as AMD did. Nvidia won't do it.
https://minerstat.com/hardware/nvidia-gtx-1080ti
That is just a mining calculator which has not been updated from quite some time,show me a running video of a Gtx 1080 ti that you have and that it does 45 Mhsh and I will say that the DAG size increase has nothing to do with the hash rate.
I have the best brand EVGA FTW3 for Gtx 1080 ti and it is very difficult to get past 42.5 Mhsh at that power of 210 watt.
45 megahash on GTX 1080ti at 300 watts