Well, I didn't fancy bumping this when I was the last person to post in it anyway, but it's been several weeks so I figure one post won't hurt. I finished! Finally beat Containment Breach and got a proper ending (my last playthrough had no electrical room and ended in various scripting bugs at Gate A). Here are the seven episodes to round off the series; I'll give you a bit of a profanity warning for ep11.
I owe some considerable thanks to you folks here for your advice, without which I wouldn't have been able to finish this playthrough either (no electrical room again, scripting issues, and so on). Cheers!