How does the Limbsaver pad compare to a Knoxx Spec-op's? I have the Knoxx on my 870, and while it does change the "punch" to a "push", I get whacked in the cheek everytime I fire it! I have looked at the pic for the proper alignment and am doing it correctly. The Limsaver claims to do wonders and is much cheaper, plus it keeps the traditional look.