Dear NisamRobot ,
Nice findings, it explainse the times before f2pool added Zcoin and 99% of the Zcoin hasrate was on MPH- somtimes the MPH hashrate was over 20% more then the total network hash rate,
I will not be surprised if the large privet farms (10G+)agreed to pay for such privet miner with cheats. We hope that MPH will fix it and it should not effect our miner performance.

Best Regards,
zFastminer team.