Part of the problem I saw on the surface when I was looking was that 22 seemed to create more confusion for the IJN than it did for helping it.
DD were constantly stopping and going into reverse to allow others to continue on their course, or they couldn't drop because of the proximity of a friendly ship.
I think any more than 3 mebbe 4 DD doing a search pattern is optimum. Any more and the AI goes nuts trying to coordinate em all.
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Snuffy!
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