Feel free to come back if you need another page on one aspect we forgot.
Sorry I forgot about Dietrich Schwenke`s intelligence review on enemy engines, this might help a little for comparisons.
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Kolbenflachenleistung = Power per unit piston area
Mittlere Kolbengeschwindigkeit = Mean Piston Speed
Forderhohe = Rated Altitude (that at which maximum power is still achievable)
Nennladedruck = Supercharger Boost Pressure, this is not well defined but is probably take off boost (in absolute german technical atmospheres)
Hochstladedruck = Maximum emergency combat boost pressure (in absolute german technical atmospheres)