how do i get ai bombers to actually bomb something in FMB?

[Danelov]

Yes, check the warload and also insert before the point to be attacked, a waypoint, a sort of IP(initial point)some miles before the target. So the plane had time to be configured by the AI for attack the target. In convoy attacks, always aproach with the same heading of the ship targets. If the target had ballon barrage like Dover or Harwich, search the less protected side or like the reality, send a couple of Messerschmitts to shot down the ballons. Typical ballons barrage are between 600 to 1200m.