Can't help you much, as I can't remember the mission well. I remember making it through on Insane but with almost all of the lifeboats destroyed. Play on a higher difficulty level because both enemy AND friendly AI will be much smarter, and your wingmen will be more effective. Stay on the move. Always be heading toward the nearest Loki. Divert all energy to engines if you can't move fast enough. Hit ALT+D when you get close to the enemy to equalize power, kill the Loki, then return all power to engines (press the Insert key several times, IIRC) and race toward the next Loki.