Vermillion,
The difference in firepower between four .303s and two .50s is slight. Yes, the two .50s are better, but so lightly as to be not noticible in anything other than a controled test.
Even then, the best you could assume is that it is a 1943 Spitfire IX, as the .50 armed Spits first appeared in 1943. There is certainly no justification for implying that the AH Spitfire Mk IX is more modern than the P-51D and Fw190D-9.
The fact of the matter is that there were infinitely more Spitfires powered by Griffon 65s in 1944 than there were Spitfires powered by Merlin 61s as all the Spitfire F.Mk IXs had been retired.
As to the perk icons. I don't limit my desire to see the perk icons removed to the Spitfire XIV. I think that all perk icons should be removed if at all possible. I think the icons should look like this:
Ar234B = 234
C.202 = C200
C.205 = C200
F4F-4 = F4F
FM2 = F4F
F4U-4 = F4U
La-5FN = LAGG
La-7 = LAGG
Me262A = 262
Spitfire Mk XIV = SPIT
Ta152H-1 = 190
Tempest MK V = TYPH
Hazed,
I seem to recall that the P-51D entered service in May, 1944.