I found the last setup to be quite good, with perked rides and all.
In my OPINION, it would be good for balance if:
Allies:
P-38L costs 2 perks
SpitV costs 1 perk (to not make the allies be spit horde)
Typhoon cost 1 perk
Mossie costs 1 perk
F6F cost 2 perks
Seafire free (and avaliable from land bases as well as CV)
Hurricanes (both) free
P47d11 free
F4U1 free (CV and land bases)
TBM free
IL2 Free
C47 Free
La5 1 perk
P-51B 3 perks
Axis:
109F4, 109G-2,190A-5, 190A-8, 190F-8, Ju87 (IL2), Ju88, c202, c205, C-47 free.
109G6 1 perk ('cuase 30mm)
109G10 costs 2 perks.
190D9 4 perks
I would add the KI61 as replacement for the RE2000
My logic for the costs comes from Jabo capability and speed/firepower. Mossie and P-38L are much more cabable "bombers" than the TBM and Il2. P38L and F6Foutperform most, if not all , of the axis rides. P51B and Tiffie are perked due to their huge speed advantage over the early 109's 190's and italian crafts. Adding the Ki61 would give the axis another plane to combat the spits and hurricanes, as well as the other cheap perked allied rides.
Adding the G10 and D9 would combat the P51 and the 38L and the F6F.
Just an idea