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I believe (please correct me if I'm wrong) that the page grader looks at the ratio of keywords to other text, not just a simple case of counting the number of times a keyword is used on the page - a 200 word page with 15 instances of the keyword would look stuffed, but a 2000 word page with 15 instances of the keyword (and its variations) would not look over stuffed - so long as you don't start listing keywords for the sake of it (this happens a lot with local optimisation - wood flooring london, wood flooring manchester, wood flooring birmingham, etc etc - yuk!) Hope this helps explain my suggestion.

This appears to have fixed the problem, thank you.  Had to add a non-breaking space before {% endif %}{{ page_title }} but from what I can tell, your solution resolved the character count discrepancy.  I expect this will be validated when Moz re-crawls the site.