SW3 pirate attack problem

[HDS66NL]

You're talking about the escort mission from XT-54 to XT-41? Well there are a few options. If I remember correctly you have the option of scouting ahead of the convoy, if you pick this option you encounter less pirates. You can hire some mercenaries at the trade station. Delay your mission and gain some experience and better ecuipment first
A long range scanner is also very helpfull for this mission.