1. They detect you above 10 then keep in contact above 0. The cross section isn't calculated in signal comparison but I've read that it works in the game (I think it's 25% when facing with bow/stern but will have to test that in a game).
2. Try hard difficulty - it's a little bit more realistic.
3. The numbers at the top show signal strength you're recieving so if it's close to 0 you know you're gonna loose contact soon. Active sonar (if disabled) shows predicted strength if you were to enable it.
4. At least that thing can be easily modified. Just copy the "Cold Waters\ColdWaters_Data\StreamingAssets\default" folder, rename it to "override", open it and go to "/vessels". There's a file there for each craft with acceleration and deceleration values among other things. Not sure how that would affect the AI though.
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