Why isn't he just letting it auto-tune? My experience with AM firmware (and all the derivatives of the main source of it) on an S9 is that auto-tune can do a decent job and then some hand tweaking after that can be done.

But what I have seen is that after auto-tune and hand tweak, it'll show great for many hours / days and then things will turn downhill. For what reason I'm not sure but I did have to go back in and do some more hand tuning. 

Just for comparison my 2 S9's  are running an average clock of around 713Mhz avg., 8.4x volts for 15.25 TH/S but that is with asicseer firmware, 1250-1300 watts, 240vac, ambient ambient 60 F, S9 temp. at 70 C with fans at 2400rpm.