回复：wait a second,

Your writing is not quite clear.
1.
Your passport was stamped with AOS.
I think you still hold a valid H1B visa. Then what is your status after back from China? AOS or H1B?
2.
You will transfer to a new institute.
Is that a different employer or the same employer as before?

From what your said, my conclusion is that you can continue to renew your H1B after using AP. Right?