" Is this resulting in pressurization of these areas and consequently causing underperformance of the supply side. (ie the room pressurizes but without the retrun the duct performance is lowered and the cfms aren't accomplished)"
Yes, whatever air supplies you need to deliver the right amount of heat, you need the equivalent cross-section in returns as well. Many houses undercut doors to act as returns from rooms to cut costs. In your situation, there is a door to the rooms over the garage that can't be undercut enough to return all the air to a central return in the other part of the house, so you need good returns equal to the supplies.
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