As I said earlier, an outside air kit to the stove will help. It will reduce or eliminate the drawing of outside air through outside walls, receptacles and widows in those back rooms. This alone will help raise the temperature back there.
It doesn’t take a really large fan to keep it livable (less than 20* temperature difference from living room to bedrooms). I don’t have any headers between the hallway and the living room. I ran a 5” fan and was able to circulate enough air to Heat 3 bedrooms, two of which are over a crawl space that is poorly insulated. The floor would be 10* degrees colder than the room. Hoping to get some insulation installed before I start of the stove again. I like a cold bedroom with a big comforter.