OK well going back to 1.10.6 "fixed" these issues. Any FYI to server owners out there, one of my community members/admins went on to some other FF2 servers and the insta kill with powerjack was present. It seems that the people playing on these servers weren't even aware?
So yeah you might want to "downgrade" or fix the problem. I had been using
https://forums.alliedmods.net/showthread.php?p=1319084 to block these weapons and it was working fine. But I found backup of 1.10.6 on my putter. I am posting it here for anyone who might need it.
And remember to disable update
UPDATE: On a side note..one of the newer "fancy" subplugins seems to be conflicting/messing with FF2. Trying to narrow it down. It seems sometimes attributes applied to "freaks" "weapons" seems to carry over to the rest of the players for the rest of the map. An example would be no critz on one freak I just uploaded and then for the rest of the map after playing that round the rest of the players didn't have critz, for instance, on the powerjack.