Air ducts are usually “balanced” to provide airflow at each register. In order to get flow from the last register in line, the duct gets smaller the further you are from the source. That theory might be giving too much credit to Keystone, so I would look into the connections at the furnace to be sure you are getting all the flow you expect. There are also “ducts” into the belly area that could be flowing too much air underneath
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Rob & Amy
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