I had also combined it with heavy slasher beams, which also do much less damage than FS ones.
That's mainly because they have lower base damage than regular beams.
They're fully custom, solid blue beams.
They have base damage greatly lowered and are all set to slash, plus they have ROF and sounds of Shivan beams.
Oh, and I forgot to mention huge cannons, with ROF of Terran Turret and "Same turret cooldown" flag, which, combined with their low velocity, makes them resemble PPC cannons from X3.
Beams and torpedoes also have "same turret cooldown", which causes beams to fire neary continously.