BnZ,
You are wrong to claim 70% because most of those aircraft are irrelevent relects in the LW environment. You are playing a politicians game with statistics to make them look like they say what you want them to. It is irrelevant that the Spit XVI is faster than a Hurri I, Bf109F-4 or P-40E as none of those should be, skill being equal, true contenders in a late war environment.
The Spitfire Mk XVI is not slow, and certainly in the mid range of speeds accelerates very, very well, but it is not faster than 70% of the relevant fighters.
Ultimately all of your talk is meaningless due to the single most important factor, and that is the impact on the actual game and in that place it is clearly, self evidently and beyond any reasonable argument, not imbalancing.
I will give you credit that you do not go into hysterics like Krusty, with claims of Spitfire XVI's pulling hard 180 degree turns and then accelerating to catch his boom and zoomer of choice down when he made no manuevers, but is magically never on film.
EDIT:
The thing Krusty ticked me off with in this thread was claiming I'd said other fighters walked away from the Mk XVI. That is clearly not true, except for possibly some outliers like the Tempest. What I had said is that if the two of you succeed in getting the Spitfires XVI and VIII perked (removed) the RAF or Spitfire fan would be limited to the Spitfire Mk IX, a mid 1942 fighter with a top deck speed of 321mph at WEP and a much poorer aceleration performance. It is the Mk IX that I said most adversaries in the MA will walk away from.
Krusty also has a demonstratable anti-RAF bias.