Jiaozi potstickers sticking to fry pan
Your problem is probably between steps 3 and 4. When the oil is rippling, it is developing ridges and troughs of varying thicknesses of oil. The troughs, or thin spots are the most likely culprit for sticking.

After the oil has started to ripple, turn the heat down and tilt the pan so the ridges and troughs in the oil start to even out, then add the potstickers. Wait for a minute or two before turning the heat back up.