The good old rear view trick does not work my friends. The SN has a 2k range while your turrets have 800m
So I never bother to go close, I just set my speed to 140 and follow the poor man around.
Also, you must be one dumb pirate not to tell your trader to back off the lane.
One thing that did get me is that, people ask a trade request, you accept, the trader is behind you and all or you are not paying atention and he cruises while in the transfer window.
Only happened to me once and I CDed him isntantly.