Thanks Ben!
I think this may actually be a case of the LMS needing to house the "per question results" as we are enabling each of these options at the moment but only showing the overall score and completion status in any reporting. I'm waiting to hear back from the LMS developers to see whether we simply need to expand our reporting templates and if so, where the data would be held within the LMS data tables.
If I have no luck there, expect me back!!