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What would be the better way to utilize it's capabilities?

Anti everything by my book, just flip the field.

but i'd say primarily Anti-flyer. Everytime.

Snapshots vs the flying targets = 6s to hit.
Annihilation Barge = TL Tesla weapon
Tesla + TL 6's = too many hits.

they are really good at that.

What IHateNids said, especially about anti-flyer. There's a recent 3++ is the new Black article that went into the math on this. Essentially, in basically all cases, it is better at killing flyers than the quad-gun is, despite not having Skyfire. When you're only hitting on 6s, every hit you get on a flyer is three hits because of the wonders of the Tesla Rule, and Twin-linking makes things even better.

The ABarge is good at engaging everything except armor 13-14. It slaughters hordes with S7 and the arc rule. It can put a lot of wounds onto heavier infantry. It deals with light armor easily, up to AV12.

Armor 14 you can't hurt, and armor 13 is a bit iffy. If you have Zahndrekh though, AV13 is easily defeatable by ABarges. Give one of them Tank Hunters and watch the glances come.

this is also why my A.Barges nearly always move 12", they can only snapshot

Why not both?

Really, use it as anti-light vehicle and infantry. That's what it was designed for, after all.