Well the issue with the 1 av = 1 pilot argument is that it's overly simplistic. There are SO many factors involved such as

-Range between AV and Tank
-Elevation difference
-Position/Availability of cover
-Damage Profile
-Hardened or Unhardened state
-Speed of vehicle
-Vehicle weak points
-Differences in SP
-Turret Type/Range
-AV Suit's fit

An AV standing out in the open, on the ground, should get his/her teeth kicked in easily by the tank. At the same you can't have a system where AV does so much damage that a single player can blap a tank as its driving by without even engaging the AVer.

There is a lot at play so its difficult to make generalized statements, but if I had to I'd put it like this "A solo AV player should be able to kill a solo piloted vehicle of equal tier if their position is advantageous and the vehicle stays within the AV weapon's firing range for a reasonable amount of time."

Yes pokey I agree it's not the easiest thing to argue because there are many factors on either side to take into account but as for Breakin Stuff your argument is Invalid due to the fact 400 hp/s is almost impossible to achieve even if there was a Cpu buff the only way to fit three complex heavy reps to reach that much rep is to be a solo tank with nothing but rep mods and the only turret you can put is a basic and with the dispersion it shouldn't be too tough for your IAFG to blast it to pieces