From my experience, hitting pbs are not as accurate as they should be. You know the drill, hitting a fat one from close range against someone and u think u do full 108 damage, but I notice most of the time that the pellets are going into the wall or floor instead of the target.
So I think there are 2 problems that are happening right now that are pretty similar. but (hopefully) solved with different outcomes;
1: The hitbox is too small for the wide spread we have (that might explain the hitting walls/floor from close range). So the hitbox needs to be a tiny bit bigger to match the wide spread we currently have.
2: The spread is too wide for the current hitbox. That means that we should go for a spread that is tighter than the current one and matches our current hitbox better. Since SG4 was the most popular spread behind vanilla, it might be a good idea we start with this one. Especially since SG4 is a tighter spread than vanilla ( if I remember this correctly).
This is based on my experience though (gardun room warrior). Since I barely cw anymore (not even at all actually), I don't have the same experience as you might have, so it might be completely different than your experience, but it is always nice to have different views on the topic :]