no back button after calculating embedded score

Commenting again to bump with further clarification:
I set the Score using an embedded data block at the end of my survey. The following element in the survey flow is a question with display logic set to only display if Score < 80%. This is where the back button becomes disabled.
Is it possible to get around this by using Javascript to reset Score just before the <80% warning block loads? I've attempted this with the following code, but it is not working. I believe for this to work, the program would have to run display logic before the first javascript instruction. Code and photo of survey flow below:
Qualtrics.SurveyEngine.addOnload(function()
{
Qualtrics.SurveyEngine.setEmbeddedData('Score', undefined);
});

Great idea mmoore ! I had tried to reset the Score to undefined via Javascript after defining it in an embedded data element, but I think this is a better option.
Posting my code here in case anyone comes across this. I messed with this for too long before realizing that the piped text for my desired value could not be written directly into the embedded data function. I had to set the piped text as a variable first.
Qualtrics.SurveyEngine.addOnUnload(function()
{
var x = "${gr://SC_0Asp7I5sXakHBgW/Score}"
Qualtrics.SurveyEngine.setEmbeddedData('Score', "x");
});