Gallon p. minute on blown PM engine

The DA is reflected in the boost, so yes it's still a valid way to get a ballpark number to start with.
The pump flow number to use in Alky Pro should ideally be at or near the pressure you run. Fuel pumps lose flow as pressure increases, some more than others, but a pump flowed at 100 psi could lose 3 to 5 tenths at 150 to 180 psi.