Don't underestimate the power of tweaking spawn times, one or two seconds change to either team can seriously effect the flow of a contested point.
My general preference is to lower spawn times as much as possible because everyone hates not playing the game. You just have to be careful to avoid turning it into a spammy grind.
Adding more space might work too, stretch that fighting area up and to the right to make it a slightly longer run for offense.. like 256 units or so.