Is the Gotek drive really picky as to which USB stick you can use? On my Gotek that is flashed for use as an Amiga drive, only one of my USB sticks work -- some off brand Dane Electric 8 gb, while my good SanDisks don't work at all. However, the same exact ones that will NOT work on my amiga gotek drive will work just fine in a gotek that I have in my PC.
I have them formatted as FAT32, and, I have SELECTOR.ADF on all of the sticks.