After learning about 5ND and experiencing it in action, I never turned back.
The 5ND method is one of the best systems for steady mining i guess, as far as im not in a way an expert, but i proved for myself that it worked better for my s7's that were working simultaneously at 4 different pools for a week or so.
This 5ND thing is fantastic, i shut down the miners from 1540 to 1710 (UTC+8) to connect & energize new power line (240v 3PH 40A

) to the miners' room, my "N Avg/ miner rewards" only dropped about 5% for today's 6 blocks.
And i notice each time Kano restart the CKDB , we have blocks party
