So I scored a full suspension sugar 3+. Im used to my cannondale ht - and sometimes with the thudbuster suspension post. So, Im new to the rear shock. It has an older cane creek ad-5 (it holds air). Anyways, certain types of bumps, the rebound back to form, the shock hits the return with a clunk - like a rebound bottoming out. Not a big deal, but I would think a soft return, not a clank would be normal. There is no noise, just the feel when it happens. On the ad-5 there is only air pressure adjustment. What gives?