If your feathers are rattling or rustling, your getting arrow movement. A lot depends on the leather your quiver is made out of it. You need to condition the leather to achieve the softest, pliable leather possible.
Breaking a quiver in takes time. Wearing it and allowing it to shape to the contour of your back is essential. Wide bottom and top, collapsing in the middle to "hold" the arrows and keep them from rattling or moving around.
I prefer the softer leather like my Creger. My heavy Schulz latigo quiver has no arrow/feather noise but if some brush hits the heavy leather, it is a tad loud. I use the back quiver 90% of the time, carry a dozen broadheads and 2 judos and never had feathers rustling around.
Once the quiver is adjusted and fits snug on your back, there should be absolutely no arrow rattle or feather noise. Never put oatmeal in the bottom.