This doesn't seem like admin abuse at all.
You shouldn't be capping and defending flags you should be attacking air and keeping them from attacking your teams armour and ground forces.
If you're are F you are doing it wrong.
If you were kicked for no ping that does not mean you have a really low ping it means your ping is being represented as a dash "-" which means you are trying to mask it from the server.
Where are you located?
Also look at these tutorials regarding how to properly use the AA.
http://www.aarpclan.com/showthread.php?1168-Tutorial-The-Laser-Pointer-Mobile-Anti-Air-Bonanza
http://www.aarpclan.com/showthread.php?1035-AA-lead-firing
Well said Whitey!!!