Instead of going in and tweaking the individual units, wouldn’t be easier to, borrowing a NASCAR term, put a restrictor plate on them (an in effect all teams, and players).
Put a limit on the number of moves a team gets per turn. I had one that had 26 moves in a row before I got to play again. That was back before I was using the 4X speed, so I was able to count them. I am willing to bet the Goblin Griefers can easily surpass that,
Putting perhaps a ten to fifteen move limit would make things a little more fair. The griefers still get the advantage of the extra turns, but the player (or AI) will not be potentially wiped in less than five moves, and be able to play and be somewhat competitively.