3.5" drive (Sony MPF920-1) goes berserk when I connect it

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Again, there is no way any type of interface that plugs into a USB port is going to be able to provide 1A of current @12V. A standard USB port has a normal rating of 100mA. Heavy duty USB-C ports, designed for charging peripherals (like phones) are rated at 500mA. I don't think there is actually a USB connector itself that is rated at 1A. Also, a 12V device needing 1A (12 watts of power) is going to need substantially more than 1A of current from a 5V booster circuit. I have several of the SATA/IDE to USB controllers and they all have a 12V wall adapter input because that is not an option for standard (non-SSD) hard drives, and floppy drives.

I can certainly inspect your SuperCard Pro board and see if it is broken. I offer a lifetime warranty on my products. You just have to pay for shipping.