Norm - Sometime back Jeff K. from Reno whom most of us know stated all strike machine were created equal and a that means they all have the same hold percentage. If you have a bad run on a strike machine it would seem you are not in tune with the damm random generator that runs the machine, about the only thing you can try is changing your pace of play and see if that helps, if not just figure your luck isn't there on a certain machine. There have been times I put $100 in a strike machine and got nothing but have come back a bit later and hit 15 or more for a $100, timing seems to be everything.
Walt