I know quiver has caused a lot of pain since the exploit was published then the ban of quiver. Why can't the quiver just be set up like golden gun? Map the action to right trigger after the super is cast and you have the time window to fire 3 shots. I am NOT saying make it into a golden gun like super just saying mirror that mechanics.
The issue comes in the coding of the Hunter Exotic conflicting somewhere, creating the glitch. Just let them do their thing, I would bet they know a lot more about this than you do. (No offense)