Hello ! On the picture before the last one I can see some brown stripes on your leaf , it can makes once think about a PH burn but it is a fungus called Erwinia carotovora ( Google it to understand ) , to treat you will need a anti fungus. When I take a look at the edge of your leaves and at the leaves tips I can recognize 2 symptoms of a Potassium (P) deficiency on a early stage combined with your dark green foliage makes me think that you experienced a Nitrogen excess earlier ( way before your P def ). To get rid of your P deficiency and your N excess I would low my N input and use a PK boost to have a better P distribution. That said I can also see that you have a plant with weird leaves , I would bet in a Bug like roots aphids or Fungus gnats , they can makes you plant grow like that and once they are settled it is hard to make them move : maybe you should consider throwing that one 😓. Last thing, to me you have NO PH related issue but you should low you PH level to 6.5 for better results ( between 6 and 6.5 ). I hope it will help you 😁✌️🏼