1st, make sure you clean the rubber of the quiver and the limb area really well with denatured alcohol etc. to remove any oil etc. Then, try to strap it well above the spot on the limb you want it, then rocking the quiver back and forth down the limb...it will get as tight as you want depending on where you start sliding it. If you have very narrow limbs, you may need to trim the rubber back some...you want the rubber just short of the limb width, not hanging over it when you have it strapped down.
If that doesn't work, a small pied of double-sided tape on the each side of the limb where you want it and strap it down tight.
Either of these should keep it from slipping.