It's up to you really. I'm in containers outdoors, when you transplant to a bigger container scourge the rootball a bit. Make about 4 vertical cuts about an inch or so deep
Everyone always screams out ph issue when they can't figure out what the hell is wrong with their plants.
Soil is forgiving when it comes to "ph" it acts as a buffer, hydro is another story.
SweetHayz is asking the right questions. If you transplanted awhile ago could be your plant is...