Cough, Izzy.
The LW lost almost 1700 aircraft in the space of 4 odd months, there from some 1200 aircraft to the RAF pilots, in 99% cases or so armed only with .303.
Those were the scores, but on to performance.
They lacked altitude performance to the DB at the time, that is correct, and that was the case untill 1942 or so.
Roll rate was absolutely horrible at top speeds for both the 109 and the Spitfire, with little to choose between, - however the Hurricane rolled nicely.
BTW, the horrible 8 seconds often quoted occurs well over the Spitfires max speed, where the 109 is also pretty much stuck.
Now on to the bunt. My great uncle was flapping around with a neg-G carburettor in 1941, so I do not know where you have your 1943 figure from. Anyway, bunting is an evasive maneuver and was used with some success by the 109 pilots since turning and rolling didn't get them out.
But don't bunt at too high speed, for -3G could be the max. And, - while gaining distance, altitude will be lost.
Then on to the fuel tank. The Spit I and the Hurry BTW had more than one, I presume you refer to the header tank, which IMHO is a rather bad thing. So I agree.
Same with cannons, I agree.