Peter - Congrats, thats an awesome stretch of trail. A group of us from DC UL Backpacking just did the entire Kungsleden in June. (Trip Report: http://www.meetup.com/DC-UL-Backpacking/messages/boards/thread/36000642, http://www.meetup.com/DC-UL-Backpacking/messages/boards/thread/36550132; Photos: http://www.meetup.com/DC-UL-Backpacking/photos/15565252/, http://www.meetup.com/DC-UL-Backpacking/photos/16106162/)
If you do head back someday, I'd recommend considering the stretch from Hemavan to Jäkkvik. You get the same big expansiveness but with more variation, fewer people, and IMO better trail.