The 40's work as fast or faster than the deckgun.. The 20 doesn't harm ships, not with TMO anyway, but it works better than the 40 for shooting off depth charge racks. Often in a storm I'll use it to come up behind a escort and shoot his racks off, but stay out of his visual range. Least if I have to dive, he can't dump anything on me.
Now, if this is a TF and not a convoy, deckguns and 40's are basically useless, a planned surface attack with torps is the best option. I may have to dive due to radar, but after I shoot, I surface and run away and dive somewhere else gaining position.
Good luck with the 6 DD's, should've attacked in the storm and ran out on the surface decks awash. Works great in a storm. I dive about 28 feet so the engines stay on, but waves will somtimes take you deeper, cutting on your electrics. You'll pop off and on on radar confusing them.
Radar may be bugged in stock. The JPS have two types, surface and air, but seems the air will pick up surface as it's detection rate is set too low to the surface. Mods correct this by adjusting the air radars height value so it can't hit surface ships. If you stay decks awash you can usually stay under the JPS surface radar.
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