Forsazh in the La-5, La-5F, La-5FN or La-7 does not work in 2nd charger gear. This is modelled by the game internally, you can also see it in il-2 compare as in 1st gear it gains 30+ km/h with 110%, in second only about 5 km/h. The only reason it gains something at all is that flying with 110% also increases engine rpm a little bit over the 100% setting (most noticeable effect above FTH of 2nd gear).
So when you're flying the La at 110% at altitude, you're actually only flying it at 100%. It overheats about as much as a Bf 109 at 100%.
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