You will find some slight variation in thickness of biscuits no matter who made them or where purchased. As others have stated, make sure to store them in an air tight container. I still like the plastic jars that the Porter Cable biscuits come in. And another important point is to make sure to secure the workpiece when plunging the machine into the wood; and not just with your hand. I have had work shift in my hand from the force of the cutter. This will make a difference in your accuracy. Stay safe and watch those fingers. :thumbs_up