I've been around on CSS for a few years now and I'll sound like your boring old grandfather you only talk to at family get togethers.... BUT, back in my day i used to play one of the most popular servers in the Australia/New Zealand area run by a clan called KS or something.
It was 24 slot alternating between office and assualt. A lot of the experienced players from that server and community are still around today and have stuck together through CSS's ups and downs.
My proposal: to attract some of these more experienced players to your community, maybe consider trialing a similar Assualt/Office server. Capture those talents from the ex-recoil, or KS communities and build stronger teams with people who know and love the game like we all do. (this is all said with a triumphant national anthem played in the background)
or disregard everything I've said
Cheers,