Don't think many people would like this but my suggestion is to enable 100% crits from the guards. Before i took a long break from TF2 jailbreak, i used to play on Outpost jailbreak, wich i think now is dead, and they had 100% crits for the guards. This made the reds not rebel that much, and so we could stop any rebel attempt from happening. When i started playing again, i found lots of rounds where all the reds would rush the guards and kill all of them, and i think that just destroys the magic of the jailbreak. Instead of playing them minigames from the map, every couple of rounds are destroyed by rebellers.