Thank you for posting, let us know if you keep it at 750 and how it responds.  Also, I see you are on MPH.  For some reason my Z9 is earning on MPH, but it is not registering on the dashboard, graphs, worker page etc.  Did you have any similar problems?  I have successfully mined using the Equihash switching, BTG, ZEN, ZCL and ZEC.  I am generating coins but no record of my miner at all on the pool.