Verm a stock G2 should always outperform a stock G6, they both have the same engine DB605A but G2 is is lighter and more aerodynamic due to lack of MG131 bulges, and also cleaner due to the G2s retractible tailwheel and no wing bulges. Many LW pilots actually said the G2 was the best 109 preferring it even over the F4, apparently it was more than fully competive vs its main competition of late 1942 and early 1943.
But we should add add MW50 to our G6, the real one ours was modeled after did have the DB605AM engine with MW50, this raised its power to around 1850hp, which would be really nice.