I would make ENY kick in that much sooner....you can fly 10v4v2 but your gonna do it in Hurricane Mk1s.
Hey now, the Mk1 is a fine bird - one of my fav rides.
As far as ENY goes, here's the argument I hear all the time from the landgrabbing horde:
"So what if we outnumber you 10:1 cuz we have ENY and you don't. You can fly a perk plane almost for free. Come and kill us with it."
Ten guys in "crap" planes is still tough against one guy no matter what he's flying.
Back to the OP...
I think it would be a great idea to have maps scaled for the average population or speed of planes in an arena. Early War planes are pretty slow and take a while to get anywhere. Perhaps a sector could be 15 miles in EW, standard 25 miles in MW and 35 miles in LW. Map layout wouldn't have to change, since the scale would change the base distances.