A question bout my setup

[deaxy]

Posted here, so I would not have to make another topic..
I use a Hacker gunship, and I have a question..
Now I use 4 hacker gunship turrets, and 2 pulses.. But the thing is, I hardly do any hull damage to anyone. I tested these guns against a barghest. Took his shield down real fast, but the hull is impossible to crack.
What should I use?
Should I sell one of the pulse cannons, and put a razor or a missile there?
I ask this, because I down usually use gunships