I've been a proponent for perking the Lancaster, B24, and B17 for quite some time. I'm talking small as in 8 or less per bomber, maybe even 5 or less. The amount of destructive capability those units have is highly under-regarded. Perk them a wee bit and the dive bombing heavy bombers, the bomb-n-bail, and the kamakazi runs vs a CV will be reduced in number.
The B29 can be caught, even at its best altitude and best speed. The Mossi Mk16 has a few select fighters than can climb quickly enough and run fast enough and catch it.
Speed is life, it the "target" (Mossi 16, Ar234) is not around to be shot at, the chance of surviving is... well... THAT much better regardless of how many guns a heavy bomber has to defend itself with.
For the amount of ord the B29 can carry, for as fast as it can go at best speed alt, I hope it has a generous perk applied.