my only advice would be, try lower rpms and always keep the engine temperaturebetween 200° and 250°.
i personaly never swith to course pitch, i always stay in fine and control the rpm with throttle.
and yes, in the british planes (Tiger Moth i dont know) full rich mixture is 3D cockpit lever full back, with whatevercontrol setting you get this. Digital info mixture reading is 0% (or mixture bar down) than !
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