So I got my hands on another system 10 pcb, swapped the rom board over, and it’s experiencing the same issues. Swapped the rom (Gekitoride) board over to the old mainboard and it works perfectly fine. I’m assuming the issue is with the rom board.
sounds like it. I would check for any trace damage or cold pins, especially on the custom. There's really not much to go wrong on those ROM boards just ROMs and the custom security chip and I've never heard of one of those going bad, that just leave some kind of physical damage.