"G10 is a late 44 plane. However there is nothing between the G10 and our G6 like a G6 with MW 50 or a G6/AS which had better performance and were available in early 44."
So what boost does a 109G-6 use then? It does @390mph, which is as fast as it went, I dont see the problem. Its not slower than it should be.
As for a 109G-6/AS well, we can go on and on about what versions are missing for all kinds of AH a/c, dozens of them. Further to that the 109G-6/AS was not a common type, and only equipped a few staffels from June 44 on, it wasnt the equivalent of a 109G-10 either.
109G-6 was the most numerous 109 in service in the first half of 1944. It was the 109 most encountered by the P-51B. Its a fine matchup, isnt it? climb rate vs speed, cannon vs MG, low speed vs high speed handling, its one of the classic matchups of WW2.