I rcently changed the #10 fork oil in my '12 Bird 1600. The old oil was sludgy and I was hoping for a less abrupt response on road ridges (bumps that protrude out of the road) with new oil. Since that didn't happen I was wondering whether a lighter oil - #5 - instead of the recommended #10 would help. I know this is a simple question and I realize forks are a complex device. If anyone has tried this and thinks it would help please share your thoughts.