I am testing a AI_sensor set right now.
While on patrol (VIIC, Oct, 40) I was sighted on a clear day at about 8600m by a C class destroyer. He raced like mad towards my position as I dove. I am at 100m and trying to stay in his rear but his turning is pretty decent so he keeps getting a general bead on my location. He has made 3 dc runs where he thinks I am .... so far this is a decent set up.
Like you, early war DD's were more of a let down. This file set is a marked improvement. Check out the Thermal Layers thread by Hemisent.
Thermal Layers
Should be something released within days.
(a lot of people have worked on this AI_sensor thing, CB, col7777, ducimus, jungman, redwine, sniper_1, timetraveller, CCIP, Catsaflung (think that is his nickname). They have *labored* on it and come up with some excellent alternatives.
Check this thread out:
Destroyers ... getting rid of the pinpoint drops