I do think the prevalence of dlacs over any other gun points to them being a bit overtuned in the current patch, but thats ok.
DLAC being ~free kinetic helps, but once you figure out a way to prevent frigates/scintillas wrapping around I think lots of other loadouts can work.
This battle is mostly decided by cheesing retreats so the Onslaughts are keeping close without blocking AND can't be surrounded.
Seriously now, non-stupid formations shouldn't be locked behind spamming 1000 unrelated commands. Even eliminate on the other side of the map doesn't guarantee the ship will start moving in that direction.
Obviously fake, Hephaestus are terrible after all 
Doesn't mean now that the weapon is good, it got carried by everything else in this build.
Their use is narrower than usual, but Onslaught needs exactly something like heph in the mid mount so it's good there.
Lots of weapons like this (HIL and autolances are also pretty niche and need other weapons to work).
I'm addicted to s mod expanded magazines on onslaughts to boost their main guns. I think it really helps vs Radiants, as they are very efficient and you demonstrate that often there are multiple onslaughts firing their TPCs on a single Radiant where other guns don't reach. During that whole long chase at the end where the onslaughts are just whittling down hull, +50% DPS + burst advantage on the TPCs is nice.
Love TPCs and used builtin mags every chance I got on them, here I think they are a hindrance.
Using burst flux on enemy far away, enemy casually takes 2 steps back, the rest possibly gets chip damage on the Onslaught.
Lots of wasted flux and time, lots of attrition.