An easy way to check if increasing your pin dia. will tighten your action is to put a small piece
of scotch tape in the hook and close the action. You can also determine how much bigger the pin needs to be by the number of shims it takes to close the gap (my tape meas. .0015) and this
would let you know if you need a new pin or a new bolt.

Kind of makes you wonder what your Greener cross bolt is doing!