First off, I love the new PvP system, but I have only ever had 1v1 encounters.
Second, I can't stand spawn camping of any sort. It's a cheap way to play. Plenty of players are winning and losing with good old fashioned naval and boarding tactics so there is no reason to spawn camp, other than to be a(an) (enter your own word here).
On the other hand, this is a War going on, and winning the war is important for both sides.
If Rare allows spawn camping, which they historically have allowed over and over (unfortunately), then they should at least turn off the Red Sea Circle and open this up to all of the adventure server to give the underdog some room to move. Or at least double the circle radius.
An alternative is to allow fleets of ships to invade the same server, to combat the fleets they know are waiting for them. (let's pretend server caps don't matter for this option). A fleet might be limited to 2 ships, but three would be awesome.
I actually like the potential this has to encourage server fleets.
Remember, you volunteered for this fight pirate. In the end, take the loss on the chin and que up the next fight. It's not like you are losing 2 hours of loot grinding in these fights, so remember to have fun, even when losing.