A little late, but last night we did manage to find SC07 after our third or 4th trip to SC05. We were running invincible hull and propellers with bronco aft and forecastle (survey @70). I took screenshots of the log after finalizing it the first time and when I went back to look I don't see the messages about finding sector 7 at all in the Voyage log (there is something in my chat log) but I kind of remember it being there when I first looked at it like I've seen in some other screenshots.

http://imgur.com/a/4PB6N