Heh, woops, sorry, my bad,
glad things are running again! i've not had good expiriences with 50 pin to 68 pin adapters, and an old friend had so many issues with 50 pin devices, he ended up getting an A4091 scsi card to run them.
at the time i had an A4kT, so could string them off the onboard scsi, and leave the fast hard disks to the PPC's scsi.
i know it doesn't help you much, but just an anecdote from my expirience.
on a side note, i was having massive issues with the scsi chain i had on my PPC1200. turned out it was the Plextor CD/RW had finaly given up the ghost. i thought they were indestructable. but it turns out that no matter what i did with the termination or IDs, everything was rosey once i took the plextor out of the loop. so i'm at a loss as to what's going on there. maybe something similar is/was happening to your setup?