I just installed brains, running S9+s and S17+s

The S9+ installs worked great.  I got them at about 15.8 TH/S at 1380W
The S17's didnt work out as well.  They go pretty high, up to 80 TH/S but its not consistent.   Was really hoping to get 80-90 with the 25% advertised hash rate, but my scoring hashrate on slush is all over the place.   The S9s are solid.

Also, not sure if i need to have the "asic boost" checked in settings. 

Also, i wanted to know if it was possible to install it on "unsupported"  devices, such as S11, S15 or T15?  Any ideas what would happen if i tried to install on those?