How high speed? 400MPH TAS?
I coldn't open this link.
Athough 3-blade Clark-Y airfoil airscrew slightly outperformed 3-blade NACA-16 airfoil, you can't draw the conclusion that 3-blade NACA-16 outperforms or same as 4-blade NACA-16.
Why didn't German keep 2-blade Gottingen airfoil in WWII? 3-blade Gottingen airfoil is better than 2-blade Gottingen?
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The Germans were resource and production limited so not having to produce another blade is attractive. Saving weight in any airplane is attractive. The German fighters had sychronized weapons firing through the propeller disc. Less blades means more bullets on any given target.
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Don't forget 2-blade Gottingen prop. could save more resource and more friendly to sychronized weapons firing through the propeller disc.
Again, German's 3-blade Gottingen vs 4-blade Gotingen comparation is not valid for 3-blade NACA-16 vs 4-blade NACA-16.