Could you post any pictures? I am still waiting for Mossberg to send me a new follower/spring assy. and mag. box. Once I get those I can "play" with the old ones and see what works.
I looked at the feeding process over and over as I worked the bolt. It seems that the follower is rocking or jumping as the rounds come up. I smoothed the sides of the follower with a jeweler's file, but no help. You are entirely correct that the follower has a lot of side-to-side movement.
I can't get it to copy but if you go to page 15 of:
you can see that the magazine box is not flat sided as it is in actuality. If it was cut and bent in it would take care of the "slop" in the follower. However, it may push the round to the right too much and not "catch" the bolt guide on the right side. -AimHigh