Interesting. I was wondering why the story took them to Vulcan, but you obviously have the plot line well though out.
The longish delay in this Chapter going up almost put me into severe withdrawal symptoms. Of course, the quality product was worth the wait, but I hope that Real Life and other interfering factors don't delay your story any longer than necessary to get good work out.
I'm sure you don't need to be told that praise like you are getting from DrT and some other reviewers is "platinum plus", as they are highly respected fan fic authors themselves, and are of the 2% who SHOULD be getting paid for their work.