Which is the point that Tomo and Shotround6 have trying to put to you.
The supercharger is the limiting factor if the engine is strong enough to withstand the extra boost.
The Peregrine supercharger could deliver +6.25psi boost @ 15,000ft with the throttle wide open and the engine at 3,000rpm...
The XP-37/YP-37 had to have the cockpit so far back because the coolers (radiator and intercooler) were placed behind the engine.
The turbo was placed, like the XP-39, beneath the engine.
Eaker and Spaatz probably would have agreed that they should have been targeting oil targets sooner as well.
https://en.wikipedia.org/wiki/Oil_campaign_of_World_War_II#Statistics
Number of attacks by the RAF and USAAF against oil targets (May 1944 o April 1945):
Eighth AF: 233
Fifteenth AF...
https://nuclearweaponarchive.org/Usa/Weapons/Allbombs.html
Mk I - Gun-assembly HEU bomb; "Little Boy" dropped on Hiroshima - Used in combat (Hiroshima) 8/6/1945, never stockpiled; only 5 bomb assemblies completed, all retired by Nov 1950
Mk II - Low-efficiency plutonium implosion bomb -...
There may have been some advantage in removing some of the guns.
For example, RAF bombers at night probably didn't need the upper and forward turrets, but the rear gunner was quite valuable, even if only as an observer.
For the USAAF, the bombers may have been able to get away without the...
In earlier episodes they showed some debriefing/interrogation scenes.
Mainly what was said in these was which bombers they saw go down, and the number of parachutes they saw.
Were the actual debriefings like that, or more detailed about strength and position of the flak defences, strength of...