Yeah, I think I can do it. I've done many experiments so far, I had DCs doing MinEF 499, MaxEF 500, with a 14.5m radius (4.5m Rmin) and that didn't do it, not even close. I was surprised.
I have it OK right now, perhaps a hair nastier, since aside from one 162kg DC, the IJN used 100kg, 105kg, and 110kg DCs. I'd expect them to only have a shot at a 1-hit kill on a direct hit.
Needs playtesting as much as anything. Just trying to get a feel for what the folks want, so I can make a couple versions for different tastes
tater