Welp. I thought I had a working arcade card. Seems I don't.
I had a Duo that would not play well with the ACD. It had gone through a lot of repairs and mods over time, so I coughed it up to that. I tested the card on another Duo and it was fine, do not give up hope on the card.
When I would play Sapphire, I would be missing sprites, I'd only have large blank squares. Most of the backgrounds where missing also. I do not recall the card getting hot tho. At least you have 95% of the obey library! I ended up finding a cheap replacement Duo that works with the ACD and kept the troubled one as a spare for cons.