Michael,
I put me a set of the big ones on my set of morrison max 4's that were had a good bit of vibration in them upon the shot. When i put them on, it took out a lot of vibration and made the bow quieter. I did install mine a little farther up the limb than you though. I spoke with Bob Morrison about it and he said to install them half way between the fade outs and where the string contacts the limb. I think mine are about 4" above the fadeouts. I am going to get some for my centaur limbs as well. No vibration, but there is a little ping in the limbs. If it works, it'll be well worth it to me!