Issues with ran out (drainage) PH. It is below 5! ...

I see what you are saying.yes week 11 photos have some very little excessive nutrient signs but as long as the plants look green and healthy and growing well,no need to do anything.runoff ph below 5 means there is surely an excess of nutes in your soil,that's why it is dropped just like your water's ph drops after adding fertilizers.instead of moving ph up,you can do flush with 30-40lt of water for a 20l pot,you'll see runoff water gets cleaner after every 5 lt.good sign.runoff ph would be increased a lot after this.but it is optional,you can ignore it as well.