I've been looking at historical Medium Naval Bombers like the Japanese G3M and G4M for example. And it seems like the Range is way too low compared to real life. Even if you stack Extra Fuel Tanks on the frame you still can't reach the historical range. And then you have no special slots left for anything else.

I think Medium Naval Bombers might need an inherent Range boost. Like how you changed the Heavy Fighter stats in your other mod.