Search for different driver and try different miners as well 1st try 2070 alone find best settings then add 1080ti. 38-40mhs looks achievable with 130-140watts on 2070.
Every test has been made only with RTX 2070. GTX 1080 ti was always disabled or removed from PC.
At the moment driver version is 461.92. I also removed it with DDU and tried an older one (446.14), but nothing changes.