Hi Tom:
No matter what, keep writing! Don’t let differences in metrics get to you. Whatever you’re usng as you rguide, as long as the overall trend is in the right direction you’re doing great.
Different services report different metrics because reasonable people can differ about what to count and when. Using feeds and a different service to host the data, life gets evcen more complex. We are trying to make a difference by enabling google analytics for click throughs from feeds we host (see http://blog.feedblitz.com/2009/04/rss-and-google-analytics-integration.html )
Stats diving after a site failure is probably a bunch of spambots deciding the site’s dead and not to fetch your feed any more. That might be a good thing. People are much more tolerant of problems and those you have left probably care greatly about what you write. So don’t give up!