They go into recovery mode when the firmware doesn't quite make it onto the drive correctly, which can sometimes be caused byâ€¦well, many things, including the controller being set up for RAID as opposed to a classic IDE compatibility mode.
You aren't going to want to use any .bin files until you can use the official flashers. The flashers use the same commands, and the official flasher is still flashing a .bin file stored inside of it, anyway.
You flash the drives the same way if you connect them to different SATA ports. It would be hard to kill them as long as you're using official flashers.
So, since you're running a RAID setup with your storage drives off the Intel controller, you can still try to connect one of the drives to a Marvell port & see if things go better. I don't have hope, since Asus has already told us that they aren't meant for optical drives & we know that Marvell controllers can be finicky.
Other than that, finding another system where the SATA controller is set up for Legacy/IDE/JBOD (Just a Bunch Of Disks) ï¼ or even AHCI is fine on some systems ï¼ rather than RAID may prove more fortuitous.