I have a Manitou Swinger SPV 4-way on a Giant AC-1. I bought it used and it has always rebounded really slowly, no matter what the rebound is set to. Whenever i hit a section of bumps right next to eachother, the shock doesnt seem to suck them up. Is this how the Swinger is suppost to work or should i send the shock in to Manitou for a rebuild? Is there anything i can do to fix it on my own? Thanks and ride on.