Best way to remove them is to pull the knock, insert a weight that will fit easily, and swing the shaft so that it slams into the insert. It will come right out after a few hits. You can clean the shaft if you want to by sticking the end in a can of acetone and letting it sit for a few minutes.
I'm with the others. Don't think it's your problem. If there all doing it, that's great (doesn't not help Arthurs argument though on inconsistancy
). Sounds like you just need to get things shooting right. It's hard for me to see how an insert could be put in wrong. I could see how one could be milled bad, and you could have a bad batch. Doubt it though. I wouldn't reglue the old one's. Get new if ya really think you need them.