actually you can base your ac on 3 categories
weapons,
choose whether you are a energy type, missile type, or normal gun shooter type.
make sure your lock on aparatus fits to that type perfectly. you should consider your lock on range and speed.
speed,
it's a factor. balance it with energy and hitpoints. too speedy means you can use energy weapons more effectively cos you don't have to use your booster more often. however, your hit points is so low that you easily dies.
hitpoints
balance it with speed. you don't always have to be the sturdy tank who prefers to be a sitting duck.
human plus
is also what you need. see the net on how you have a human plus. some raven's nest top rankers has human plus advantage.