You don't chase down Typhs, P-51s, or "pace" D9s in a Mossie. Nor do you E-fight with nearly 5K a minute in climb rate to work with....
Which is,
yet again, irrelevant to the max.
One can at least try and understand the irrelevance of a single pilot's anecdotal trial of a certain plane doesn't add up to much against the general consensus formed by numerous other pilots who've been dedicated to the plane for years.
Its like me flying a P-51D and arguing nothing has changed with the flaps.
Like, how sensitive would I be to the degree of performance change in a P-51 with flaps out - a plane I rarely, if ever, fly - and much less fly it well enough to the extent to actually feel a drastic change between the current and previous versions in the first place?
...
Besides, none of this in the first place, again, has any relevance to the matter at hand. You don't perk planes for their individual performance. You perk it on a relative scale, according to the impact it might have in the MA. And whatever impact the Spit14 may have in the MA, it is already done by other planes of its peers, which already have been roaming free in the skies of AH unperked.