Forts need to rotate when they are open and lock more often, so people anticipate and plan themselves to contest it.
Like every hour or so only 2 forts can be contested at the same time for a certain period (30min~1hr) before locking again. They lock and we have another 2 forts open in a different location. This is important so people dont disperse in different forts, the shorter window for contesting because theres always people who wait until the enemy fac is gone to recap it.
More important than a good rotation its that we have WARNING CALLS from the server saying that a fort is open for contest, just like the WAR prompts when some faction declares war. Otherwise people wont notice.
Better rewards: PVP track is nice but after a while you wont get much EXP killing the same people while contesting a fort, so i believe some fat rewards like cache/gold if you capture the fort would be nice.
anyway, just some ideas. i like OPR/arena but i think theres so much more than instanced pvp.