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It should slow down if you program the stock in bypass as cardstock. You can try other stocks such as transparencies. (not sure what other stocks are avail on this model).
As for the misfeeds, pull the bypass tray all the way out. Youll find a black roller in the back. Run it in the sink with water, then set the tray upside down to dry. You might reach in and clean any other rollers in there with a damp cloth (with water). I suspect toner on the rollers causing slipage.