Issue number 1 is over tightening the barrel but it most cases. Try loosening it off and retightening with a bit of card / plastic in both sides of the hop to keep it straight, worked for me before.
Second issue sounds like everything’s too loose, could even be you’ve gone too loose on the barrel but. Have you checked the screw in the mock gas tube hole that holds the hop dial in place?
Take some pictures of around the hop area and post them up, might help.