Have you tired rich mixture? Lean mixture is for cruising and reduced fuel consuption at lower power settings (and incidentaly if moddeled correctly should give higher engine temperatures) whilst rich is for when you need power.
The Spit has auto rich which means it will automatically adjust for altitude so you set it to either rich or lean and leave it alone.
There is a game control for carb heat but I dont think the Spit has it (please do correct me if im wrong, I know the P51 does using the later merlins but don't recall the spit having it). Whilst carb heat will stop your engine icing up it will reduce performance as well as warmer air is less dense and therefore your engine recieves less air.
BTW I haven't flown the Spit much in game but this is generally how it should work and how it does work on the accusim A2A version.
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