My 60 came with 3.10, but I put the scsi in myself.
The floppy on mine is the one it came with when I bought it, but it says ASQ-1 reject or something on it in pencil, so it may have been replaced.
I have only had a few disks go bad in my floppy, so I got a cleaning disk and used that every month or so.
I would shell out the cash for the Forat floppy. It's guaranteed and a great move. Also, return the Route 66 floppy if you can. These thingsd arent easy to find (otherwise route 66 would have found a floppy that does work and sell that). Part of the cost of the floppy from forat or vst is their warehousing costs. They are the place to get what you need for your old Akai when no where else has what you need. That sounds like the situation here.