In general it seems prop pitch is quite subjective and infinitley tweakable, SB bombers run along just fine at 4000m at 60% pitch 70 %power, usually 280-300 kph depending on weight of load. Pe-2 zips along at 70-70 at 320 kph with heaviest load. Since patch 411 its almost 10% lower in pitch than throttle setting works best? There was an old engine guide from the forgotton battles cd rom that had usefull info with pitch and rpm guidelines, 2200rpm for stuka, heinkle etc.
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