With a PDR HX-40 I get 28 injectors alone, 32 with injectors and vanaaken, and then 39 when adding in the blue box. I used to get closer to 50 with the stock HX-35. The bigger the turbo and exhaust housing, the less boost you will see for a given amount of fuel. Dlange, your numbers seem about right for the 50/55 with your level of fueling. My numbers seem a bit low to me but I belive the PDR40 is wastegated at 38 or 40psi.
Kevin