Technical note:
Because you are trying do some serious thing, i noticed that your treaty miss one serious part:
How you will solve and who will solve disputes if treaty would be violated, or if it would looks like the treaty was violated. Because all gangs are sovereing in their behaviour, the only one solution is to create some kind of committee, that will investigate all violations. In this case, the result of this comittee could be statement with recomendation power. I do not expect nothing more

My suggestion looks like useless, until you realize, that you want to hold this agreement alive, between 2 major enemy blocks in the wasteland.
Other (current) aproach is equal to calm before the (troll) storm.
Your Sudrol, (Lordus's older sister).