I've only had my first PP period so I can't offer too much advice, but I looked at your chart and it looks like you did have your temp shift. Have you considered using OPKs to help confirm O'ing?
When TTC #1 I used OPKs and I wasn't a fan. I only used them 1 per day and only got a positive on one out of the three cycles I used them...obviously I need to use them more than once a day, but I just found them annoying so gave up and just temp.
Can you not O, but still get the temp shift?