Amlyn cartridge drives

It does not seem like I'll be able to find media for this gadget, so I've move to Plan B: Reverse engineer the 5 existing diskettes I have. Since the originals are read with a WD FDC chip, I thought this would be a matter of letting ImageDisk have at it to determine the format. Unfortunately, IMD cannot make heads or tails out of what's on the diskettes. They do seem like they have 80-tracks, probably at 500KB/sec data rate - at least that's what IMD tends to converge on in between cascades of low-level data errors. Even at full analysis setting it's not able to decide what it's looking at. These diskettes read fine when I connect the unit to an Apple 2, so whatever is on them is intact. Anyone have an idea how to decipher it? I have a suspicion that they deliberately offset the tracks from a "normal" position. At one point there was a special fluid available to reveal magnetic domains under a magnifier, but this seems exotic and not something I would know where to obtain.