You'd really have to take a look at the server population records and the numbers of people that log into the online game, but log out when they see LW is full, or EW and MW are nearly empty. Not sure what all HT servers track.
Population is key to finding a good fight.
Maybe the Early War and Mid War arenas should be rotated for a while. I like both --- I prefer mid-war --- but I'll still findmyself in LW when EW and MW have almost no one online.
Rotate them once a week on Weds like the old MA maps? So, one week you have EW available, one week you have MW available? See what happens with population numbers then.