Have you been checking your water ph before feeding/watering?
I am not sure how you plan to test ph, soil ph test kit? my suggestion def don't waste your money on one of the soil ph probes, they tend to be trash. Test the water before it goes in and if you wish you can test the run off. Invest in a good ph pen (blue labs is a great choice), take care of it and it will work for you for years to come.
Best of luck. Also if you just fed yesterday you may want to wait until it needs it's next watering to feed again. Otherwise you may overwater and start a different issue.