[mjfmicheal]

In addition to the other ideas here you should also check the vents themselves to make sure they are all the way open. Sometimes moving things around can push the little round thing that opens and closes it. Adjust that round mechanism so that the slats of the vent are straight up and down. That will allow the most air through.

This is designed so that you can customize the amount of air in each room. After doing that, I would leave the bedroom door open and all that should do it. Good luck!