Did some digging, so corsairmi use the HID protocol to communicate with the PSU see, since rm and hx psu are HID's see:
https://forum.corsair.com/forums/showthread.php?p=663107&p=663107
my ax1600i does not report as a HID, so corsairmi will unfortunately not work. corsairmi would need to be rewritten to support what ever communication protocol the ax psu's uses.