It seems that the built-in has higher priority on the Nirvash, so it never really tries to broadside unless it finds itself in range of them. Well, aggressive officer makes it work, but only until it explodes. Try replacing the lance with a launcher, maybe that makes it work? I think it needs a weapon with the 'dont aim' hint to make the broadside AI work properly.
Pulsar Beams are in a pretty good place now, I think, except the flux use on the Large.
Misery/Bane also need a flux use reduction, since they have no burst to speak of. They have nearly the flux efficiency of a tachyon lance atm.
Neutron Pulses are still awkward. I really want to like them, but the projectile is too slow, the flux efficiency too bad and the dps just not worth it.
Disruptor/Antiproton/Darkmatter/etc all the rest looks fine atm. Will keep playing, I don't have the skills/ships to test out the top-end large weapons yet.