I agree with @Greene
. Take cutting and start new plants.
The problem may be that the plant was so stressed with the potting soil problem, that it will take some time for those ill-affects to run their coarse. Starting cuttings will be your "emergency" plan in case the plant continues to decline.
By the way, @Thughorse
. When you have a moment , update your profile by clicking on the little "guy" in the upper left-hand column. Then click on "Change Your Public Profile" and add your location. This can be city/state and/or USDA zone. Scroll down to the bottom of your profile information page and then click on "Save Your Changes". Now, every time you post, we will know where you are.