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You could always just dampen off some of the other registers in your other rooms, which will create more pressure in your duct system to force air into the room. ( essentially instead of dampening off at the trunk line you just do it at the register.

Most Residential A/c systems are calculated by the square footage and ceiling height. An average is 400 Sq. ft per ton of air in a room with an eight foot ceiling. Also each ton of air will put out 12,000 BTU's. Make sure though that you take into consideration your ceiling height, number of...