Ooh, good idea
I was planning on bleeding the system again anyway, but I've never adjusted the rears so I should probably do that.
A couple other things I thought of: is it possible that the check valve could be clogged or something? Or the hose that runs from the booster to the engine is clogged? I'll play with the pedal travel and pumping up, but I'm really concerned about the engine idle changing while I'm pumping the brakes, I think that has something to do with the booster.