On that mission you really have to take a different approach. As soon as the reactor "stabilizes", fly through another ring. This helps destroy ships attacking the center reactor while you protect the rings. It's really easy on the easy difficulty setting. I actually did it on Formidable even, just focusing on making sure to fly through the rings each time they became available and only protecting the center reactor when a ring wasn't under attack. I used the Mark III armor on this mission, even on Formidable, for the faster pulse canon. I think...... I might've used the "classic" armor on formidable actually, can't remember now.
**** forum mod please delete the above multiple multiple copies of that post. Dunno how the heck that happened while I was still typing it.*****
1st & only person in world to land exactly on 100,000GS w/
100% completion including all DLC, 101 games played, 9-22-09