Ok so, I've only played this game for a little while however from what I've seen so far. The line battles are real cool, however what tends to happen is that they occur at a distance where the casualty rate is low, so the reinforcement rate from spawning on a flag bearer just cancels out any kills and a few games. Especially on the more open maps, are just people shooting at each other from a distance with no real effect.
I was thinking a small increase in the reloading speed when enemies aren't close (to simulate less danger and thus more efficiency). Thus it would allow for a slightly increased casualty rate and hopefully one line will break then. So the shooting actually has an effect.
However keep the reloading speed as it is for when an enemy is close (within some set distance) to simulate how the stress/pressure of the situation effects someones ability to quickly reload.