Its called the tank buster and chances are you are missing most of your shots because of spread. Use the Vektor/Spur or the Zephyr for this instead. Maybe they might add an AI nose gun at some point but I don't expect it to be in the near future.
wrong weapon for the job. The liberator has both the belly gun and the tail gun for the job of killing infantry, the pilot should focus on vehicles and aircraft.
Because the whine from dead infantry would over whelm the dev's and nerfs would be brought out in mass.
I'd trade an A10 clone for a lib all day long. But that would be way OP. The Hellfire loadout combined with the nose gun would solo armor columns.