Large bolt pattern brake HELP! HELP! HELP!

You can start diagnosis by seperating out the two systems. Front and rear. If you are sure your brakes are bled properly, disconnect either the front or the rear port on the master and block it off. Pump the pedal a few times and if it gets high and hard, you know to look in the system you unhooked. Or, if there is no improvement, you know to look at the system that remained attatched. If you were to plug off both ports and the pedal didn't improve, it would be a master problem.