Has anyone experience the "thump" (as STS describes it) with a single STS on shorter A2A bows? What about the double? Did it fix the problem? I'm trying to decide which one I should get for my 30" Bear Instinct. And will the rear mount work as a front mount? I hear people complaining that the rod is way too long on the rear mounts, so I figured it's the same product that they market as two different models.