The spit 14.
If I understand it correctly (and it being a spitfire, its about 50/50 odds that I do), the Spitfire 14 has a redesigned high-alt wing, which resulted in poorer handling either at low alt or across the board (I've never taken a spit 14 up high, so I don't know).
Nope, same Spitfire wing, initially the Universal Wing with the 2 20mm and 4 303s but mostly the E Wing with 2 20s and 2 50s. The only "high alt wing" for a Spit was when they added extended wing tips that could be found on the Spit VI and VIII which were designated for high alt. Some early VIII had them as well. But the XIV did not. Based on the VIII fuselage and Wing. Even the high alt Spits with extended tips had the same wing. There are photos of both VI and VII where they removed the extended wing tip and put on standard wing tips. VIIs got used for ground attack after D-Day for a bit and had standard tips.
One of the trade offs for more power was less docile handling. This applied to all fighters. The Mustang probably should have had it's tail enlarged when it got the Merlin. If you look at P40s they did extend the fuselage and tail as the engines got larger. The D9 did this as well with the fuselage extension and larger tail surfaces.
With the Spit the tail grew as the the Spit did. Standard rounded tail on the I, II, V, VI and early VII, VIII and IX. Larger pointed tail introduced on the first Griffon Spit, the XII. This was then fitted to most VII, VIII XVI and many IXs. Even larger tail on the XIV, XVIII and 21. Finally the really large tail on the 22 and 24.
