The bot may know your location, but the code looks to prevent it from actually attacking while it doesn't have that knowledge. So yes, leaving your AA off will keep you "dark".
Using your AA after the planes miss is perfectly fine. You'll want to juggle it on and off to deal the instant damage of Priority Sector but cut it off to go dark before the planes finish turning around for the next attack run.
Do remember that Carriers receive Team Spotting. If your Marceau is spotted by any other ship, the planes don't have to be within your Aerial Detection before the Carrier will "see" you due to Team Spotting.
Marceau isn't very sneaky as DDs go.
This video directly shows that a Bot will attack correctly if it can "see" you to start the attack at the right time, but will not be able to hit you if your Air Detection is lower than the distance required to start and finish an attack cycle.
I capped all the caps. They were only cappable because the bot would overfly due to the DD's low detection. It could only hit me if I kited away from it (increasing the distance for the attack run) or shot my guns to give a larger detection to assist the planes.
ASW Planes are dropped extremely accurately. It does make Sub play in Co-Op hard, but a Sub can do its best to avoid detection.
AI Sumarines are quite accurate with their pings, so that and the homing feature makes them an actual damage threat in Co-Op.
Easiest thing to do is just provide a Replay of what concerns you.
This is not correct. I posted a video where the only way I could cap was to avoid detection because the German rockets need a long distance for their wind-up.
There is an amount of time between starting an attack and being able to actually attack.
Plane attacks have two timers:
Preparation
Recovery
When you click the attack button, you have to wait [Preparation Time] seconds before you can attack. After you attack, there is a small attack animation. After the animation ends, you have to wait [Recovery] seconds until you can start your next attack.
If the Weser planes are slow enough to spot you, start an attack, and then drop their ordinance before overflying you than that's something to factor into your play. It could be that your DD has more Air Detect than other DDs. It could also be worth sailing toward the planes so that the time between you being spotted and the planes overflying you is made shorter. You can force overflys in that sense.
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