A few things come to mind. Before we start, I too hate hydroboost!
First, it's already been mentioned, the shoe to drum fit. If the lining isn't radiused the same as the ID of the drum, the shoes will flex causing low pedal, but also spongy pedal. Since you have good pedal on the second pump, I don't think this is the real problem.
Also there could still be some air. If you don't have a reverse bleeder, you can make one with a new, clean oil pump can (might run some brake cleaner through it first, just to be sure) and a short piece of hose. Pump the can until you get solid flow, put the hose on the wheel cylinder bleeders, and pump backward through the system. Helps to have someone watch the master cylinder to see if air comes out.
Another suspect is the master cylinder. Not sure, but worth doing some research, I suspect the standard master cyl bore is smaller than the cyl used with hydroboost. Maybe the wrong master cylinder.
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