"so I would not give up speed of the arrow to quiet the bow. Just my opinion."

Tom, Matthias's gizmo supposedly doesn't affect fps. He has two versions, one has arms sticking out like the new Horton recurves and then the main bumpers by rail, the other is just the bumpers by rail, but did look like he glued something to the inside of limbs, which HAS to cost a few fps, lol. I think the 600 gr arrows have alot to do w/ it!!