Didier,I wouldn't be so quick to heap so much praise on Yuncheng IELTS School for having employed more than just a few non-white FT's if I were you.That has been done simply because very few white louwai apply for teaching posts to there.I know for a fact that whites are preferred by said recruiter,but teaching in such a backwater place only appeals to very few of them.
However,I can appreciate why it would be a good place for you to teach at as you would be able to enjoy yourself in the company of your African brothers there.So I hope you succeed in getting a job there.Good luck with your job application!