During the last few days, I have been 'changing the dampers' for cooling season. The changes are mostly to open the upstairs runs fully. They were slightly closed as heating was more than adequate. Downstairs adjustments were slight, but the tendency was to err on the side of closing them down (to optimize upstairs flow).
After reading your posts, I'm thinking I should open up the downstairs runs which originate closer to the furnace and (if I understand correctly), would reduce static and possibly send more air to the farthest register (upstairs).
Do I have that right? If so, should this procedure be limited to the first trunk section (2 transitions downstream). Also, current furnace and a/c is single stage; will be replaced shortly by 2 stage a/c and Mod furnace. Any difference in strategy?