I preliminarily agree with your Preliminary Data Analysis.
What I DON'T understand from Hustedt's graph http://www.facebook.com/photo.php?fbid=10150844451570375&set=o.135474503149001&type=1&theater(and your spreadsheet) is why there was NO heat transfer to the secondary circuit until 13:22. Maybe they didn't turn on the eCat's input pump until then.
