As far as field proximity goes, I love FesterMA. Easy to find a fight without flying for 20 minutes, and if the furball dies before I get there I can go to another field without having to refuel. If one base's fuel is porked, there's probably another one close to my target that I can up from. You have to pork 2-3 bases' fuels to stop an advance. A little more distance between fields would be fine, but 25 miles seems like too much to me now.
Just to throw my $.02 in on my personal desire for a map: I'd love to see more high-alt fields. Not a 10k field next to a 2k field, but maybe an 8k field next to a 6.5k field. AKPizza tried this to some extent, but some fields just had rediculous alt differences; an 8k field near the coast makes CV attacks on that field almost impossible. I'd like to see a gradual stepping up of the alts as a team gets farther into an enemy's homeland. This would give the defenders an advantage as their country started to falter, and slow the advance of the steamroller hordes that get going once one country is weakened. Actually give an advantage to the people trying to push back the invaders; not huge, but 1 or 2k right off the runway.
The other reason I'd like to see this is to give the high-alt fighters a chance to show their stuff. We all know that lalas and tiffies are fast on the 0k deck: what if that deck was at 8k though? People aren't as familiar with plane performances at alt, and this might give planes whose performance was optimized for the more historical mid- to high-alt (152, jug, 109, etc) a chance to operate at their intended altitudes. Might add a bit of variety to the planes we see all the time once the hordes see that their uber-lala's wep is useless at the alt they're flying at.
Glad to hear you're working on another map though. I hope it's as much fun as (or better than) your first one.