Random groups in SH4 have a max spacing of 2000m, and spacings are all even in both directions.
In addition, the ships maintain spacings regardless of terrain, so if they go into any tight spaces near islands, larger spacing might present a problem (getting into or out of port, for example).
Regarding the variant DDs, I'm unsure. I'm actually the one who made them, perhaps they presented an issue at some point not worth tracking down (every new node ID added has the potential to CTD the game). That said, Kagero and Yugumo are only a little different than Asashio (AA guns and platforms, for Kagero the torpedo reload position).
It would be straightforward to add the proper DDs to specific groups. Find the references to Asashio, and replace however many with Yugumo or kagero (on the disabled mod, obviously).
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