Well to start off, I wonder if its your rear brakes (10lb residue valve) thats the real problem. 10lbs sounds like a lot to me, and you did state prop valve was in rear circuit, and are you sure the MC does not have any internal residue valve and are you sure the discs are on the correct circuit on the MC?

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.