I’m not sure there’s really an issue here. Does anyone else feel that the convoy disruption rules are unclear?
The convoy rules are perfect.
Need no markers to show control.
The loss of IPCs is caused by the number and kind of enemy warships hunting the convoys.
You can clear off the Seazone with planes (except subs) and don’t need to send warships.
Subs can fullfill their one and only determination: HUNT CARGO VESSELS!