If you have 2 aeon Arty sync their fire rate together by pausing fire then letting go at the same time.
but slow rate of fire and low area of effect, 3 aeon arty can get through pretty much all shield setups if used right. they are the most accurate and have the highest damage and longest range.
Aeon arty T3 are the best shield busters of all T3 arty.
skilled players you may need 4-5 (depending on race).
once you have 2 or more arty (depending on race) you may be able to tear through pretty much any amount of shields of the average player.
This only applies if you play FAF im a rank 2000 and play eco maps like the pass which is heavy on arty im very experienced in these fights.