That was my impression too. I haven't flown them much apart from single player campaigns (i usually fly 190As), but recently i was practicing coops with a friend of mine who's a new convert to IL2 and i got some stick time with various models.
My numbers here are approximate because i just hopped in and started flying, i didn't do any detailed tests. In any case and with some approximation, it seems that down on the deck and up to 3000m of altitude it starts getting heavy around 400km/h IAS. If you go higher however, for example 6000m or more, it gets heavy at 300km/h IAS or less which doesn't make much sense since the air is actually thinner up there, so that leads me to believe that it's probably triggered by TAS and not IAS as it should be.
If i remember to do it later on tonight i'll try to run a rough test on QMB: start a mission at 3000m, go to wonder woman view where TAS is displayed, dive and try to pull out at 400km/h TAS or so, then repeat the same starting at 7500m.
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