Try going to full rich at altitude, then get back to me.
Mixture adjustment is not a magic performance enhancer. All you can expect is to have the aircraft running smoothly.
I've had my Hurri/Rotol to 25,000+ ft online and it ran Ok. It's no P47 at altitude by any stretch, but it ran smoothly.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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