Performance charts lie. It is as simple as that - read them, enjoy them, then throw them out. They measure performance in a part of the envelope which is rarely relevant. Planes do not fights with full flaps out, nor do they go round in flat circles at the minimum speed possible. If you enter a sustained turn with a twin Fighter, you are doing it wrong.
The practical reality is that the 109G6 is the worst of the 109s except the Emil. Even in the mossie I do not consider it a major threat and will enter a knife fight without hesitation. At speeds above 150 mph the mossie is able to hang on to the G6 and even cut inside it by blowing a lot of E for a one shot opportunity - and given what the mossie spews out of its nose, that is all it takes. I have much less experience with the 38, but by relative comparison I assume it can do the same.