I probably should have ordered some of those MAM-A discs as recommended earlier, although I've dumped quite a bit into CD-Rs already.
At some point, I may tweak the pots as suggested, too. Right now, it's working well enough to make me happy. I finished a run through
Mugen Senshi Valis with only an occasional missed read on getting a Game Over that it caught on a second pass. Other stuff has been working fine.