Hey Kevin,
I'm curious as to how you're measuring how much the machine pays out. Remember that these machines' software is tested over millions of spins, so even a positive return on a few hundred spins is just a blip to the random number god.
I have 2 KP3 machines and about 25-30 games, There are some games that I was really lucky on initially, but now many thousands of spins later I rarely hit a bonus or a decent payout on them.
There are also sometimes seemingly 'quirks' to different payout levels - for instance at the highest payout on a couple of my games (94%), I could never ever hit a bonus, but changing it down to 91% resulted in far more regular bonuses. Maybe it's just me, but sometimes these machines still feel like 50% voo-doo.