I use a sharp broadhead covered with some Vaseline to make the slit in the rubber. You will want to pay attention to the fletching position/orientation to minimze/eliminate the feather rustle between adjacent arrows at the shot. You can do this by shooting with field points in your arrows and taking a picture after you found that sweet spot where there is no noise. I am assuming that like me you position all your broadheads in the same orientation on the arrow.
I always put some Vaseline on the rubber gripper slots as well to eliminate a possible squeak when you remove the arrow. Murphy's law was originally "named" by a bowhunter. This naming probably occured in cold weather with a few expletives.
I also put a dab of Vaseline on the bottom side of the rubber gripper so I have some along and can quiet a newly developed squeak. A little dab 'll do ya!
As a note, I have been using the SAME GNBCO strap-on quiver on my bows since 1999. I have not had to replace the foam, gripper, or the straps.