Unfortunately Gotek USB emulator is not 100% compatible with PSR-9000 floppy disk.
Probably your Gotek USB emulator is fine and you don't need a new one.
I install mine a few years ago and I don't remember exactly the processes and the mods.
From what I remember, my technician had to add a switch to the Gotek, since the way the PSR-9000 recognize the floppy disk drive is quite different from the rest machines.
I can't help more but I remember that we find the information and some wiring schemes on the internet.
So if you perform an extensive search you will be able to find the same schemes.
In any case mine never work 100%. I was unable to access more than 1 floppy disk partitions on my USB. It was a quite frustrate experience but since I was unable to find more floppy disks it was the only solution.