I suggest you to keep apart the "Core-1" case from the bigger ones, just 'cause -anyone can notice that- it's an easy startup, which doesn't require the Admins approval, nor an advertisement of its existence.
Said that, my chars are touched from this thread and the one by Sombra Hookier.
For a "Core-1" PoB, could be refined the chance of an encounter between its defencers and the attackers?
Something like a planned destruction attemp (or more than one?), together with the already regulated grace time in the attack declaration.
As is now, the PoB keepers will stay pressed for 2 weeks (or whatever time is), exposed to any kind of aggressors tactic, at any moment.
Considered the ingame traffic, we should favour the player interactions, over the random meetings and such unbalanced needed logins.
PS: If Shaggy allowed, I could post the link to the ongoing situation on which you could discuss in practical.
