I have 9 GPU working but is a Mix of 8 RX 580 and 1 GTX 1070, I can add more GTX 1070 but zero RX 580 because  windows 10 only supports 8 of each Nvidiai + AMD mix as far as I know.

The fact that you can see 9 of the Nvidia on device manger with no error is good start since we always see some type of error when adding more then 8 of the same.  

Have you try with claymore 10 ?