It is better to always think these things through, it can literally be out of the frying pan into the fire. I am toughing out my current gig as I only have 3 months left.

Me too - my t/a is a real nitpicking bitch. I've bawled her out a couple of times between classes, but she's as stubborn as they come. I told her she can ask the company to switch her to another county if she dislikes working with me.
The problem with middle school oral work in China these days is that students are looking to be entertained, and they have the power to get their FT out the door.
Like you, I'm financially secure enough to stick it out until the next gig next term. And I'm not teaching on a Z, so I don't need a release letter!