try moving the elevator up/down until it loosens up a little servo buzz is not as much of a big deal as you would think.
question is are you trying to move the control surface more than 20% over the recomended throws,if so then don't.
it just makes the model more out of control if you do.
move the push rod to the next outer opening of the control horn so you are in the recomended range, then work in the elevator by the up and down method after a few movements past the buzz zone then re-check to see if the buzzing is gone and keep going past the tite spot untill it opens up the gap,it doesn't take much.
re-hinging is a pain, and unless you glued the elevator to the stab it should loosen up with a little work in.
if you don't line up the hinges just right your going to get your buzz right back.
then you will be right back where you started after doing a bunch of work that you thought you needed but didn't.