The defending force needs a substantial surplus of fighters (about 50% of the total number of players in bombers) over the number of escorts in order to make the necessary number of bomber kills to win an objective.
Unless I misunderstand you, Using this method the Axis were only 5.5 players short of this number in frame 1.
Breakdown of Frame 1 -
Allied Fighters = 50
Allied Bombers = 19 x 3 = 57
Axis Fighters = 54
If you're not including every bomber - (just the pilots) - then the proper breakdown according to your math should have been -
Allied Fighters = 50
Allied Bombers = 19 x 3 = 57
Axis Fighters = 59 or 60
Now if you're including every bomber ship the number was way off, but something tells me that isn't a desirable side split either...
Allied Fighters = 50
Allied Bombers = 57 (19 humans)
Axis Fighters = 82 or 83
Of course, This isn't really an accurate representation of the current FSO side split, because you can't add players to the Axis without taking players from the Allies.
Taking that into consideration the numbers would look something like this:
Allied Fighters = 40
Allied Bombers = 57 (19 pilots)
Axis Fighters = 60
In the end, that's basically a 50/50 split.
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To me personally, in an assault style setup (where one side is attacking with bombers and the other is defending) the traditional objectives of Bases, Strats, and Ships become player controlled bombers. It seems to me, when players (bombers) become the objective of the opposing force, then the defenders/escort of the bombers needs to at least have equal numbers of the attackers because there is no other objective. Despite the differences between 57 heavy bombers and say a large airfield or Carrier Task Force, we wouldn't intentionally limit one side to have less defenders or attackers in the case of a meeting engagement style setup.
Personally - My biggest take-away or issue with this setup is the lag warping from 19 bomber formations packed together, Which I have offered a solution for several times over the past year or more.