You need either map rooms on the airfields or a town next to each so fields can be captured.
Map rooms create the big dot on or next to fields when there is one owned by the field. None of your enabled airfield icons from the CBM window show a map room object dot. GV\Flack\Ports have one incorporated, but you will have to add a map room object hidden out of the way for each CV. To have this terrain in the MA, you have to allow all airfields, ports, and vBases to be capture able except for the three you designate uncaptureable including one with 163 available.
If you decide to place one of the uncaptureable fields Gv or airfield anywhere but nearer to the HQ, ask Hitech about the placement. On bowlma I originally made the three tiny GV bases in the center caldera uncaptureable because he posted once it did not matter where they were located. Then after inspecting the terrain for MA approval, he disabled the uncaptureable tag I set for those three GV bases.
You also need to visit every single field and up at it in a plane and test your spawns and inspect the surrounding land for problems. Like exposed object seams, bad terrain transitions in elevation and GV spawns to see if Gv's even have a chance of getting out of the trees. Depending on how you feel about GV's in the game, if you purposely paint dense trees between the spawn and field to defend the furballers, don't put in a GV spawn. It will be more honest and not help drive GVers out of the game. They pay $14.95 and help keep the doors in Texas open so the furballers can shoot at each other.
If you are OK with GV's, use a stop watch and time how long it takes a tank from a spawn to get to the town map room and how long it takes a tank from the airfield to do the same. I set the spawns on my terrain so "airfield tanks" take 5 minutes while "spawn tanks" take 7 minutes. If you opt for only a map room object placed on each airfield for the capture. You may want to put a grass ring around the airfields to have the tree line about 1\4 mile away. The tanks will have to target the airfield with 100% of their attention which will get hard on the furballers who just want to get off the runway. Towns help keep enemy tanks away from the airfield, think about how many have been captured out from under you over the years while you furballed, versus how many times you tried to up a plane and got a multi tank salute as your spawn vulch.
It helps to remember the community is not here for just one biased kind of activity. These days about half the community flys planes and half drives GV's and they are "paying Hitech" for access to that. I chose to balance my terrain to that reality with a single bias against forcing the community to spend the night flying c47's to get radar back up or their resources healthy. Listening to players through the 2 years of the alpha\beta and the time leading up to completing my terrain. Universally they do not want to waste their night at the mercy of their strats any more than they need to. They want quick action in aircraft and to not spend their night caught by trees or lost in dense forests trying to drive forever just to get bombed or sniped.
Looks like you have the begging of a fun terrain.