Heating ducts in 2011 BC3250TS

Since the furnace is farther forward than out last 5ver the bath & bedroom are warm but the living & kitchen are cool. I don't feel we are getting a lot of heat out of the rear most heat register. Has anyone else experienced this? I am thinking of installing a Suncourt Equalizer EQ2 Register Airflow booster available thru Lowes for about $35. Has anyone tried this. Thanks. Ron Day