I have a Santa Cruz Carbon Blur XC that Ive just installed a used Ario 2.2 w/LO on. It is installed "upside down" from what would be considered the conventional orientation, i.e. the schrader valve is at the low end. I previously had this shock on a Gary Fisher Sugar without any issues. The shock tops out very harshly when it returns to the full extended posistion. Hard enough that it will produce a pretty solid knock. I tend to run it pretty firm for my weight (140lb) and rebound damping set at approx 80% of fully fast. Any thoughts? THX