I think the Okinawa map is a good example of why HiTech sets a minimum distance of 3/4 sector for any map in the MAs. It is too easy to find yourself climbing out of your base only to be over the opponents base before you hit 2K.
That being said, if you find yourself over the enemy base, get the heck out of there. I asked two or three separate times in one sortie for guys on my side to get out from over the enemy base and let the Spittys up. They would start to move, then turn back as soon as a plane appeared on the runway.
Oddly, one person asked "What am I supposed to do? Hug my own ack?"
We need some kind of buffer between the fields to let both sides get up and get a modicum of alt before engaging, and eliminate any excuse for hanging out over the enemy field.
IMO, of course.