Actually I think usually due to the tiny size of fighters, capital ship weapons have a hard time targetting them. Of course once they do, it's not pretty ; P I'm also a member of Cilionelle's club, but I'll be leaving most of the heavy work to the master builders. I'll just be cheerleading with a bunch of TIEs at the ready.
Makr the Turbolasers shoot twice, just hit on a critical symbol, but if the Fighter does not evade, it would be outright destroyed. That would be somewhat realistic if you check your Stackpole and Alliston Books. Really difficult to target but with lots of BANG!
For Medium ships that would of course be a little drastic… Make it some 5 ish damage for them perhaps!
Oh and of course if the gunner missed a Rebel fighter in 1 distane of an imperial you should check if the Tie does not eat the stray shot perhaps XD that would be fun…
Like Black 5 radios: "Turbolaser battery 32 check your fire, Black squadron elements crossing your zone in hot pursuit of Rebel scum!"
Battery 32: "Negative Black squadron we have them in our aim! Break off pursuit we are firing"
BAM: "AAAAARGH!!!! *radio silence"
Black 6: "Battery 32 you #*^~#•$ you just killed Black 5!!"