In regards to federal events the cop stack itself is not the problem, it is the amount of lethals that will sometimes stack it and on top of how gamechanging vans are at feds only propagate that issue. Personally for feds I think the cop limit could remain untouched and would see more balance come from removing APD cargo vans, but keeping the transport as you can't see through the cargo van, and either removing the up gradable security on vans or allow civs to blow them up.