The main issue is the fact that police officers prefer not to join server 2 because they are outgunned. If it was drilled into cops that in order to prevent the constant moaning about the quality of server 2 role play for us and everyone else, the only option is patrol it in numbers.
The number of police online does indeed affect the quality of the whole server, likewise the number of a certain gang would affect the quality of the server.
Essentially stop trying to be arses to eachother, baiting and constantly looking for gunfights or the basic 'put your hands up and drop you shit.'
Basically convince cops to player server 2 then there won't be a problem with the gangs all playing there because the cops would and WILL eventually put them back in their place.
(more likely we will get put in ours but we can dream eh?