Thanks! What version are you using btw? (0.60 or 0.61?) (By the piranha comment, I'm assuming .61) - what did you think of the difficulty? (Also, /any/ victory on this mission is going to result in a very high score, because of the huge number of enemy ships)
I played through a bunch more times on 0.60 just to check: and it turns out that the AI /usually/ caps them efficiently, but I had a couple playthroughs where there was a definite lag in their capturing of the two corner objectives, and one time where only one corner objective was quickly captured.