One thing I notice is that you seem to be rating on a linear system. Once top speed drops to a certain point turning and firepower count for more than speed. I expect other traits will also fallow a curve as well.
One of the statistical issues with this is that some categories are rated more than once. Top speed has three categories, ASL, <10k, >10k. So out of 24 categories it represents 12.5% of the total (raw) result. Of course if it gets distilled down to just Top Speed, then the P47N would be the top of the heap and this is meant to be for MA play, not FSO play. Turning also has 3 categories. Gun package has more than that, lethality, firing time, and muzzle velocity; and all three are for primary and secondary guns, 25% of the raw score.
Yes Karnak all of these scores are on a curve. The Z-Score curve is a bell curve. -2.00 = a score that is just over 2% better than all the rest of the POSSIBLE scores. Possible not necessarily meaning exisiting. -1 = better than just under 16%, 0.00 = right at 50%, 1.00 = better than just over 84%, 2.00 = better than just over 97%. So you see (or maybe not) that the better or worse a score is, the further up the curve it is and in reality the more impressive it is.
Because of the nature of Z-Scores and the bell curve, a 2.00 in one category is the SAME as a 2.00 in another, or any other like number. Z-Scores turn apples and oranges comparisons into Apples to apples. That is true of the raw z-scores of course. Adding any modifiers like Anax has done changes that to some extent, but only in so far as it makes the new ratings tailored to a specific subject, in this case MA A2A. Naturally it goes without saying that those modifiers are subjective.