Not sure what's up but an inspection of the shoe to drum contact is in order. If the new shoes were not arced to really fit the diameter of the drums, this could be the issue. When the shoes were new, even a small contact area on each pair would produce decent friction. Now that you have made some trips with the car, if the shoe to drum fit isn't using most of the friction surface, the shoes have glazed and a lower pedal results to get the car to stop. A visual inspection should confirm this. If you have good shoe to drum contact, I would tighten them up some. Other than air in the system, there isn't much else that can give you a low pedal. I would also verify that the self adjusters were not mixed side to side at any time while work was done. As you cycle the adjuster arm with your fingers, as the arm moves down, the star wheel should make the link longer. Good luck.
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