The drive still makes the suspicious sound like it's repeating seeks and through Drive Setup at least it will fail to partition and format for the ProDOS file system (We'll see it the Apple II utility fairs better) but otherwise the drive is performing flawlessly. I'll leave it at that.

As for the cabling I pulled out another SCSI enclosure that had a factory made variant to the cable I made. That one works so tomorrow I'll reverse engineer that one and see what changed.