Dbbs are quite fail. There are reasons few ppl use full set of dbbs for faw. There are fits of one dbb for bo in pvps, but that's highly situational. In pve, beam arrays parse the highest number because of large arc. Faw covers full 270 degree arc for beam arrays, but only 90 degree for dbb. Csv is different, it covers the same 90 degree arc from turrets to dhcs. Faw fires at 2 targets (different for each weapon), while csv fires at 3 (same 3 for all weapons). Dhc csv fits end up parsing much larger numbers than dbbs faw fits.
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http://skillplanner.stoacademy.com/?build=fedjoinedtrillengfleetavenger99fixed_0
Then cannon fit it with dhc and turrets.
3 techs. Marion, 2 projectile doffs
An aux2bat build would take you to a new level.
My PvE/PvP hybrid skill tree