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What is your question?
Are you asking what the proper size of the duct should be for those rooms? if so I need the load for each room. Square footage isn't an accurate way to size anything. I sorry but your .981 cfm per room can't possibly be right.
162 = 7"
178 = 8"
I assume those are the rooms you mention as too hot.
Bath room is bigger (5") than needed but you'll appreciate the extra heat in the winter. I wouldn't bother changing it.
Do you have any more questions?