[Phil_K]

I think the problem here is that the author of the campaign has probably left the G4M gunners at "average" when they should really be set to "rookie". Not only does the G4M have a 20mm rear gunner, but G4M gunners are almost supernaturally accurate.

The general principle with Bettys should always be for rookie gunners. If you go into the FMB or .mis file and re-set the gunners, you should get more playable missions.