If I may comment on this setup,
It may seem out balanced, but there was an FSO not to long ago which stacked up A6M2s vs P38s P47s and F4Us.
I thought it was going to be a turkey shoot too, but it ended up being an Axis victory.
There are a few late war monsters on the Allies side, but they do have some weak points that the Axis can play to their advantage.
IMHO the B29 should be put at a lower alt limit OR have formations disabled, a tight group of good pilots can destroy any incoming aircraft in that thing; it carried 20k in bombs, so having no formations shouldn't limit its destructive power.
Just a little side note, maybe some squads will take no formations, limiting the points the Axis can get from the B29 kills, and it is fun as hell, we do this regularly in FSO!
Whatever the outcome is, I'm sure the CMs can make this a balanced event, if it doesn't turn out so clean cut for the first Frame, I'm sure there will be changes.