[cctalk] Mac SE/30 + SCSI2SD: Disk errors and random crashes

I have a recently recapped SE/30, and I have installed a SCSI2SD (v5.0a) inside it. I don't have a (working) CD drive, and the floppy drive is broken, so I configured SCSI device 3 to be a CD-ROM drive, and put the System 7.5.3 installer inside it, along with a copy of the patched "HD SC Setup" utility, so I can format the other SCSI devices, which are configured as 2GB hard disks. Booting from the "CD" works fine. Formatting the disks works fine. I cannot get the System 7.5.3 installer to complete. After copying a few files, it complains that an error occurred, and then aborts. Additionally, if I attempt to copy the contents of the "CD" to a hard disk, after copying a few files, I get an error that says a "disk error" occurred. It's not the same file every time, it copies a random number of files successfully before erroring. I've have also had a few random bomb errors, although these do not happen reliably and I haven't managed to come up with a way of causing them on demand. They may have stopped after I swapped the RAM, although that is speculation. Things that I have tried: * Playing with the "SCSI Host", "SCSI Selection Delay", "Enable Parity", "Respond to short SCSI selection pulses" settings on the SCSI2SD. No combination seems to make any noticeable difference. * Swapping out the RAM on the SE/30. I initially thought the RAM was bad, but I replaced it with a different set and the symptoms are exactly the same. * Removing the case back, in case something was overheating inside. * Replacing the microSD card with a different one. None of these have altered the symptoms at all, and I'm running out of ideas. Any suggestions would be very welcome. David