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Sorry to hear about your problem.
I just went through a similar situation on a job. It sounds like the system was not designed with enough tubing, since the design did not take into consideration the platform bed and the rugs; these items block a large amount of the radiant heat. I would recommend having a heat loss calculation redone or adding additional tubing. In my recent situation, we actually had to add additional tubing in the ceiling to get the adequate heat, because a built-in bench was added which surrounded the room. Since this bench sat directly on the floor, just like the bed and rugs, it was enough to block the existing radiant heat, so that more had to be added to compensate the difference.
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Best of Luck, Brian
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There may be other issues that I cannot see because I cannot see it firsthand. The 20 degree difference is not that bad, but the floor reading of 80 degrees seems quite low; if the tubing was not spaced close enough however, you would get low readings. You have to remember that the 150 degrees is transferring over a larger area. I would verify that the air is indeed bled from the system, then I would remove the bed and rugs from the room to see if any drastic changes occur.
Architect
12 years designing, specifying, troubleshooting HVAC systems