I'm actually pretty familiar with languages and the issue of fluency. You don't have to be a native speaker in order to pass the CSET. If you're not interested in teaching it, that's fine, but maybe don't highlight that bit of experience. We've had long-term subs in our foreign language classes who didn't speak a word of whatever language they were supposed to be teaching; they were just warm bodies. They could definitely put on their resumes that they "taught" Spanish or French or whatever, but it would mean squat if they couldn't also back it up with passing a proficiency exam in the language. I don't know if that's what's going on in your case or what, but it could be what the reviewers are thinking when they look at your resume. Also, you should think about cooling it with the weird "investigator" stuff. Those sorts of comments are odd and unnecessary, especially given that PPs were offering you legit advice in direct response to questions that you asked. Since you said that your resume includes your reasons for leaving, I'm wondering if your resume looks or seems unusual and strange to reviewers. Can you edit out the personal stuff and post it here so that we can see what it looks like and offer feedback?