I've been in a few matches now where one goldfish will sit at range near the floor of the map and lob Lumberjacks into our airbag. Our airbag is perma-dead, their friend takes down our hull armor, and we barely touch the ground before exploding.
There is nothing to counter this. All you have to do is sit back at range and lob lumberjacks to win.
Yes, we have been trying various combinations against this tactic. No, nothing as worked.
Either nerf the lumberjack damage, reduce airbag repair/rebuild timer, reduce Lumberjack clip, reduce Lumberjack RoF, or damage on contact with the ground.
[EDIT] Just played with this combination in a match. Using charged rounds, the hull and balloon are destroyed almost simultaneously. As long as their armor is down when they hit the ground, they will die. Which isn't too much of an issue, seeing as the Lumberjack has 5 rounds per clip with Charged rounds and fired semi-automatic.