The concept behind the EFA bowquivers is sound but requires that they be installed correctly.
Rule #1 is that the leather/rubber material under the velcro be trimmed to fit. (Edge of the leather/rubber should be about 1/4 inch short of the edge of the bow. This is vital to obtain the lateral tension required to hold firmly in place.
Rule #2 is to press firmly against the hood or arrow gripper when installing, and fasten the velcro tightly.
If both of these are done, your quiver should hold firmly in place.
I have installed these quivers on a large variety of bows with good results. We provide instructions on how to attach them to the bow. Ocassionally
someone will buy a bowquiver without the instructions, or will not read them (as I usually do).
In extreme conditions (mountains, swamps, hunting horseback, etc.) you can put double faced tape on the limb under the rubber contact. I've never found the need to do this, but under extreme conditions, it may be added insurance.