Well, as per my understanding, one can leave the mixture lever on "auto rich" in Hurris and Spits. lean, or "weak" as mentinoed in the pilots notes is used for high alt cruising to conserve fuel. Leaving it on auto rich should be fine for every altitude as it's supposed to be automatic.
And also, I can confirm that high up I can't fly the planes either, and not because I don't know how things work.
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