I believe you are correct regarding eliminating the CSD coolers and the fuel dump tubes. The horizontal tail was also shorter.
You probably already know of this resource, if not, its a pretty good comparison between the -1 and later versions that the later marks.
"TAILHOOK TOPICS". Here's a link. http://www.google.com/imgres?imgurl=...ch&um=1&itbs=1
If for some reason the link doesn't work just google "TAILHOOK TOPICS" and search the August 2010 articles.