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Another thing I did was remove the inside cover on the AC and cleaned up and retaped (foil tape) the interior plenum areas. The factory tape job was pretty sloppy in there. This ensured the outbound duct openings were smooth with no restrictions and ensured the panel between the supply and return sides was well sealed to prevent air leaks.
A small flat head screw driver works well to remove the ceiling vent covers. They take a little coaxing but do pop off easily.
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