Faction soldiers spawn rate, location and movement pattern has been changed, and thus front-door camping has been fixed.
Thank you Jagex.
Now we still have one more problem.
This has led to more people actively seeking out the factions soldiers, trying to kill them for sacred metal fragments, which still makes it hard and frustrating for people to gain their sacred metal fragments.
I suggest making the sacred metal fragments a 100% drop. I think this is the best you could do with the battlefield at hand.
In future World Battles, however, I think you should defenitely take the route of having a larger, less graphically intensive battlefield, with more soldiers running about than in the current one, but not having the sacred metal fragment (or if something like that will exist in the future) as a 100% drop.