It's hard for me to judge you since you seem to know what you are doing at the university. I do have a university degree and I do not feel qualified to teach at a university, in China or anywhere else. The Chinese have a saying "White cat, black cat it does not matter as long as they can catch the mouse." This applies to you, since degrees in ability and common sense are not given out anywhere except by "Life University."
I am curious but how did you show, or what did you do to show the university that you were qualified to teach? I know that in the states some technical fields are taught by professionals with many years in the trade, many without degrees. Do you consider yourself an English technician, or a college professor? I am just curious, and am not trying to demean your work or what you know. I've had Phd. college professors who could not teach worth squat. Take care.