Tracking Storyline quiz results in Moodle

Hi

We've built countless Storyline courses, though never wanted/needed to track results of knowledge checks/quizzes in the LMS. For a new project we do and I just don't seem to get the settings right. I've tried exporting to Scorm 1.2 with tracking set to Passed/Incomplete and also to Passed/Failed. I even tried Scorm 2004 which I later saw Moodle said didn't work, but what I uploaded just appeared to work just fine. It didn't solve the problem though. We have a results slide and though "hidden" on the last slide looks like it is set up correctly. 

I can't get Moodle to track the results properly. If I set tracking to 'highest score' it shows zero in the gradebook when the activity is complete. (I've been logging in as a learner to test different options) If I change tracking to 'learning object', it reports 1 when the activity is complete. What I want it to do is show the learner's score. For example, 5/7 or 71%

Is there perhaps someone with experience that knows where the problem might be? I'm attaching one of the Storyline files I'm trying to upload, just in case the issue is there. (Its the first time we are using results slides too, so I may be missing something obvious.)

Any help would be appreciated.