Might as well have two arenas then.
1939--43 and a 1944-46 that includes the might have beens.
1939-43 keeps out the ubers and would allow for a larger variety of equally performing aircraft. You'd be elminating the LA7, KI-84, P51s, Tempest, 262,163, Ta152, 190D9, Spit XIV and the late model Jugs, Corsairs, 38s and 109s. And adding a P39, early model 38, maybe and A36 or P51A as well as maybe an Ki43 and some of the earlier Russian and Italian stuff.
the 44-46 could be the AH Quake 4 SWOTL arena then
Add the Do335, DH Hornet, Meteor, P80, MB5 maybe along with all those maybe Luftwaffe and Japanese birds and unperk all the ubers.
Dan/Slack
who'd fly the 39-43 arena