[CB..]

I'm not sure just how much effect these entrys have on the destroyer gunnery BUT;

open the sim.cfg file (with notepad for the novice)

and edit these entrys
[AI Cannons]
Max error angle=10 ;[deg]
Max fire range=6000 ;[m]
Max fire wait=12 ;[s]


reduce the error angle and wait time then increase the range and if the logic applies to the main guns then they should be far more dangerous

try

[AI Cannons]
Max error angle=0 ;[deg]
Max fire range=8000 ;[m]
Max fire wait=5 ;[s]

for example--

otherwise there are variuos tweak programs (time travelors) which should enable more direct control over the DD main guns