Rock, I have.
I didn't like it at first (read it right,I LOVE the quiver), I had some issues to overcome with fit and placement due to the daypack. Not as much with the fanny pack.
However, with just a few tweaks and twist ties or similar (lil carabiners,other ties) I found that it still works very well.
One big change was shorten the strap and NOT have it over my neck, but on the shoulder. That is where the ties come in. I tied into the daypack straps to keep it from sliding. Don't give up without a fight.
ChuckC