Tried to post earlier and couldn't, but want to coment on the last, if you have good blocks and a good punch on tool you don't need to squeeze the pins. Sounds to me like you have a difective or worn out blade. I've punch thousands of pairs, as I'm sure others have, with no problems to speak of. The punch on tool has a specific opening for the pins so they make correctly, I'd try a new blade first. As far as using high and low setting, the only time I use low is when I'm looping from one pin to another.
