There is only one vent in the MBR and it is more distant from the furnace than those in the great room thus more opportunity for the heat/cool in the duct to be affected by the temperature in the attic. Thus the heat is lost in the winter and the A/C is lost in the summer. There are 4 vents for the abt. 650 sq ft of the great room/kitchen/nook space or about one per 160 sq ft. But only the one vent for the 230 sq ft in the MBR. Combine the loss of heat/cooling over distance with the fewer vents per sq ft and you should not be surprised to get the result you are seeing. If you use your ceiling fan with upflow in the winter and downflow in the summer you can increase your comfort significantly. The only other thought I might offer would be the decrease the flow to all the other vents which would result in more even temperatures but decrease your energy efficiency and raise your bills I would think
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