Damn thing gives you headaches to get it working again once powered off.
This is mainly because all transistors need to be clear of any power that's left through the system.
Even my platimax PSU had issues it needed clearing of the remaining power left in the capacitors to get it working again.
It's really a shame they designed the power in such way and not connect the power to the board directly so the board would regulate the power and capacitors.
It cost me another hour to get things working again only to find the miner turn off again, so swapping modules around again to get things working.
With this I need to wait and wait for all power to drain from the power from the machine and try again
This happened when I tried to tune the miner with frequency setting 250, so my guess is tuning this system will only take more of your mining time then you want.
that would not be a good idea - PSU manufacturers have decades of experience in designing high-efficiency components. if bitmain atempted its own 120/12V regulators it would almost certianly result in efficiency well under 80% (try 60-70%)