Greetings from Maui! after much help from the forum I got my 580 cutting on all 3 decks pretty good with the new motor on the right hand deck. The trouble is, that deck seems to spin slower and stops altogether when you get into thicker grass, where the front and left decks mow nice and tight. I don't have gauges so I can't test flow, but I notice if I lift the left deck a little, the right one begins spinning again. I lubed all the grease ports, checked the belt tension and the blades all spin free. Ideas?