If the board plays and you're getting inconsistent reads I can say with 99% certainty that you are using a Willem. They don't support 2716, 2732 or 2764 worth a crap. You might get lucky and get a few good reads but the support for them is terrible. There are probably a few different revisions of the hack so ideally it needs to be dumped but if you are using a Willem you probably won't get a good read. Even when it reads consistent crcs on those types of chips, one or two are probably bad.