Instead of 4 WW1 dogfight arenas, how about 2 ww1 and 2ww2? 1 WW2 arena being furball lake, 1 WW2 being a setup similar to the WW1s with a strong wind 3k and above or something. Get rid of furball lake in the DA, and have it be an actual "Dueling Arena".
Or heck, since the numbers are dropping in WW1 already, you could just have 1 WW1 arena.