About the supercharger...
At "normal flying alttitude" I really don't believe that pulsing engine rpm to add small boost to supercharger rpm would be efficient. As it takes its RPM directly from engine RPM there would be no (turbo)lag and it would not transfer the "kick" when coarsening the pitch.
Centrifugal Supercharger (as in DB601) gives more boost the higher the rpm is and because the rpm relevant of the Engine RPM, the extra boost is lost when engine RPM is dropped.
Still if there is some changes on superchargers own pitch on level flight this is incorrect but I would believe that Chargers pitch changes only by alltidute Untill it hits its top performance pitch. --> After this point the extra oxygen was given by water-Methanol injection? because german belived that extra stage or added turpo would be heavier for added high alt performance than MV-50
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