I've been working on the config file trying to tone down the "super destroyers" a bit myself. It gets really irritating having a WW2 Japanese era destroyer act like it has a modern ASW Frigate's sonar.
I've made some changes but I'm still fine tuning them. If you go too far the destroyers act deaf and blind so that's no good either.
Here's what I've done so far:
[Visual]
Detection time=1 ;[s] min detection time. ;was 0.5
Sensitivity=0.01 ;(0..1) min detection threshold double detection time.
Fog factor=01.25 ;[>=0]
Light factor=2.8 ;1.7 ;[>=0] ;was 2.0
Waves factor=1.0 ;[>=0]
Enemy surface factor=350 ;50 ;[m2]
Enemy speed factor=15 ;25 ;[kt]
Thermal Layer Signal Attenuation=5.0
[Hydrophone]
Detection time=10 ;[s] ;was 1
Sensitivity=0.02 ;(0..1) ;was 0.04
Height factor=0 ;[m]
Waves factor=0.55 ;1.0 ;[>=0] ;was 0.75
Speed factor=15 ;[kt] ;was 20
Noise factor=0.2 ;1.0 ;[>=0] ;was 0.5
Thermal Layer Signal Attenuation=3.0 ;[>0], 1 means no signal reduction, 3 equals signal reduction to 33%
[Sonar]
Detection time=15 ;[s] ;was 10
Sensitivity=0.008 ;(0..1) ;was 0.01
Waves factor=0.6 ;[>=0]
Speed factor=15 ;[kt]
Enemy surface factor=100 ;[m2]
Lose time=30 ;[s]
Thermal Layer Signal Attenuation=5.0 ;[>0], 1 means no signal reduction, 5 equals signal reduction to 20%
Hopefully this will help you out. I've been running several single missions and campaign patrols to experiment with the settings. So, far it's a little more "realistic" in my humble opinion. I'm also using the TMO and RSRD mods.
Please give me some feedback if you have any suggestions.