FYI, some servers limit the aircraft to "observation" types only, like the M6-J and V-22 (there's also a medical Blackhawk). This helps keep it fair, such that you don't have players in Hueys etc. taking pot shots at everyone they see. The V-22 is a good choice since it's very cool, and -very- challenging to fly!
It's a fine balancing act between too few vehicles and too many. The knee-jerk reaction these days is to have maps with literally hundreds of vehicles and aircraft, but that removes a lot of the challenge and reward of finding and repairing a vehicle, making gameplay quite dull. Conversely, too few vehicles makes it really tiresome to have to run everywhere!

The server itself needs far more frequent restarts to re-seed destroyed vehicles, and to re-seed the helicopter crash sites. (every six hours is quite common) Without frequent restarts, you have players/teams hoarding and thus denying the best weapons from others.
Thanks for the great effort so far!