Even stock DCs would do nothing at all at 100m. The range that they will shake your boat is only 50m, so if the boat shook, what you thought was at least 100m was actually under 50m.
I've been testing DCs a lot lately. Allowing, indeed encouraging them to attack me. I take no damage unless the ashcan is very close with TM values.
Perhaps the 2d charge shacked you? The DCs in SH4 (presumably 3 s well?) have no collider, so they can actually pass inside your hull and explode (there is no hull to them). Perhaps that was the issue, damage has got to be bad when that happens.
tater
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