I'd like to hear you and Sun from AD send out a statement here and at the Reddit entry of this same post that you're not responsible for this 5C'ing suddenly happening to Winters (more has happenned, as you are4 well aware, I know) and that you disown it and condemn the "do anything to win" mode that these players are using.. which if they succeed, conveneinetly benefits you and AD directly.. and the Empire as a whole.
This 5C tonnage is not unusual, they dumped 40k on a Torval system in the last hour once. You have the resources to cover that margin so I'm afraid you'll just have to build the safety margin into your operation. The fact of the matter is that if you want Weaponised Expansions, which I don't, then you'll also have the chance for someone to Weaponise something you really don't want Weaponised.
CMDR Justinian Octavius