I THINK that doesn't determine what gets reported, but HOW it gets reported, ie: as a small convoy, or a large one, etc.
The small numbers really appear in the campaign layers (random!) called 41a_jap_merchants (something like that). Every instance has a time interval for checking, and a % chance of creating a contact rport in the first place. I think all those numbers result in way way too many contacts. The reality is that US subs did not make contact reports for ships they sighted unless they were major combatants, and they'd not have a chance to attack themselves. They would never risk DF detection before they atatcked. Never. I think the bulk of SS radio contacts were patrol reports when they were RTB.
Anyway, changing those means changing properties for every merchie random instance, times 2 layers per year... Hundreds of entries.
Stuff like this:
ReportPosMin=2880
ReportPosProbability=50
So every 2880 minutes (48 hours) there is a 50% chance that 1-2 merchant group will generate contact report. Most shipping is in areas well outside allied air cover for the first couple years (the above is from 1941), so the reports are coming from ULTRA or subs. Typical speed is 9 knots, so in 48 hours they are going 432 nm. Given typical paths they take, they sail for maybe 6+ days, so it's statistically likely they will generate a report--likely every single, individual merchant will create at least 1 contact report per trip. That's just absurd. The %s need to drop to maybe 5-10% IMO. That alone would dump the traffic down enough we would never need the mod to reduce the radius of reports.
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