A Rig and Coliseum remix, plus a remix of Torque and Tyrant. That leaves 1 new map + its remix.
Wow, while opinions can't technically be wrong you went and did it!
Stormbreak has awful map flow, even if you own the fortress + 1 armory you're still forced into a bottleneck where the other team will be. All paths converge into the same area. Then there's the possible 150 deficit at the beginning of the game from Lochagos. The Fortress almost never gets captured once it's taken initially. It's far too easy to defend, by the time you clear the fortress + kill the marines the other team can either respawn and run to contest or just spawn a vehicle and contest. The only time you ever see it captured is when the Warden spawns and by then the game is all but over. It has no redeeming factors.