I'm not trying to get ahead of Terry, but Bow quivers change the bow's reponse, more or less, and it seems it must change some with how many arrows and what type are on it. How much difference it makes, I can't say, as I decided to do without bow quivers pretty early on.
That said, until you develop good form and consistent fairly tight groups, its hard to tell what differnces tuning items make - bow, arrows or quiver.
One of my biggest barriers to getting to good consistent form was blaming, or looking into, and changing up fine tuning of the bow and arrows. Much of the effects of these things, unless pretty far off, make a lot less difference in point of impact than form glitches like 1/4 inch vs 6 inches.
I had a bunch of arrows that weren't spined right 'til I got my form working, then they all grouped together.