I realized today that the new blades that I bought were thicker than what the manufacture recommends. Thicker means heavier, and I'm sure that was affecting my blade speed. New blades have been ordered, maybe this will remedy the problem. herler, what do mean did I take the deck out of transport position? As far as deck design, I have kept an eye on the underside of the deck. It cleans itself very nicely, so I now build up blocking is not an issue.