Hi Nick,
If you save the configuration settings and re-publish your course do you see the values come through?
Unfortunately the assessment plugin as it stands has known issues in the builder. The problem is that it's an article assessment (i.e. can only be applied to one article per course) and doesn't fit in with the architecture of an extension which we can support as present.
There have been recent discussions on the core team on how best to re-write this. If you absolutely must use assessment, I would disable it in the builder and add it by hand, i.e. by publishing the course and working with it the old-fashioned way in an adapt_framework folder.
I should clarify that the spoor extension is enough to track SCORM completion. If you don't require scoring, etc. then just leave the assessment.
Regards,
Brian