So, I came across this discussion on Durability of targets...
https://forum.il2sturmovik.com/topic/35187-durability-values-post-kuban-release/?do=findComment&comment=753060
And next, I've updated all of the 4 missions running on our DF server.
So, if you find ships impossible to kill - or maybe too easy, like glancing at them with VR death rays - you know who to blame... Me! Eh, no, the editor of that post I mean...
It's all good now isn't it?