Some suggestions in the order you posted great ideas;

reduce Bombay factory to minor
play G42 instead then switch back the diplomacy is a great module…or just start everyone at war!
Yep.  Agree on split neutrals easy mod
Pro-neutrals under control…  Germany too powerful and positioned though.
islands of 2 IPC; or more agree.  too abusive on Hawaii/wake etc.
scrambling seems a crucial deterrent power, its too weak as it is…stratbombing is devastatingly powerful
transports should only defend, otherwise they are better than destroyers as cannon fodder
agree, convoys everywhere, no problems.
I like that destroyers can carry 1 guy from the pacific game but since they can only noncom or combat it makes it kinda limited…