I have much the same problems. I work 2nd shift so my flight times are between 11pm and 6am EST. When trinity is up, it is pretty much worthless. It's a NICE map, but it;s designed for 400+ players...when it is under 200 at my hours, I have to take off, grab for 20 minutes over the mountains, and then hope that enemy counter i saw is still there for one fight. I normally like flying challenging birds, but I almost need a g10 or pony to maintain sanity on trinity. I don't think i've done more then 4 missions before logging in over a month...
EDIT: To add a possible solution instead of just gripe..how about either a 2nd arena for smaller maps, or a server that plays with large maps from noon-midnight and small maps from midnight-noon...The maps could retain their status so the fight could be continued the next day. I realize that this would require either a new arena or twice a day maintenance...but c'mon...1000 people paying 15 bucks deserve that.