Nate, if it ain't broke....
Seriously, the critical fit is back where the receiver fits into the stock. If you're looking for added stability, that's the place to go. There has to be some tolerance at the end of the forearm to give you room to pivot the whole schmegege back into place.
Diddling with it won't get you an iota of 'improvement' in anything but personal aesthetics, and could be counter-productive by introducing some new 'slop' somewhere else.
FWIW, even 'glass bedding" isn't likely to get you anything to speak of in the way of added accuracy on an SKS. As long as there are parts that move during firing attached to the barrel, fine accuracy is gonna be real hard to get. See the article on the Krebs Custom AK varient in the current issue of "Guns" for realistic best group expectations and explanation.
The thing that the SKS and the AK designs have in common (besides caliber) is that there is a significant mass which has attachment points in direct contact with the barrel in-motion during the firing cycle. This is gonna affect the vibration harmonics of the barrel. If the barrel reacts differently to every shot, your potential for fine accuracy is greatly limited.
Accept it for what it is: an inexpensive, rugged, dependable carbine with all of the practical accuracy that it needs to perform its designed task of delivering torso hits to 300 M. Close enough for government work, and likely the best that most folks could deliver with about any carbine.