Welcome,
You have nothing to worry about mate, your command of the english language seems just fine, and better than some native speakers of it (myself included at times) !
the game was unfortunately not released well as we all know, but the Devs seem to have made an honest commitment to put things to rights, and if they can carry this out, and bring to bear all the possibilities that seem to be hidden inside it will truely be a sim beyond compare.
you have obviously been studying up on the Spit IIa/ 109 issues, there is at the time an inbalance when the IIa is included in the plane set, weather the IIa is over modeled, or correctly modeled, and the other planes are under done is up for debate, myself being a diehard 109 fan think that the match ups although not perfect are far closer to historical reality when the IIa is not
included, and there have been many fantastic battles in which the pilot who flew smart won the fight no matter what he was in. that is just my opinion anyway
i am sure that over time the accuracy of the FM's will be corrected by the devs and any issue will be resolved. i definately wouldn't let any of the above deter you from buying the game, if you have a system that is up to the task there is plenty of fun to be had, and it's only going to get better. the game is very scaleable so jumping into full CEM is not required if you dont want to jump in the deep end, so the learning curve can be as easy or as difficult as you like, once you are into it do yourself a favour and get a track IR5, this one single gizmo will add as much enjoyment and immersion to your flying as using a joystick versus the keyboard does.
it is a lot of fun already and will only get better, jump on board mate.
Craig