the pH from runoff, its going up along the weeks, ...

Tbh with u your ph run off doesnt mean anything it will always be different depending on how your soil buffers it you are using coco your ph is to low first off you should be 5.8 6.5 even in coco this is giving u slow growth if any thing u should check the ppms look imna be honest its a bunch of bullshit you do not have to check either plus u shouldnt never water till runoff once again dont believe everything u hear your plants are overwatered this also is causing slow growth plus u using tomatoe nutes imo that horse piss but u need the cali magic i run this also let them dry out fix your ph asap within 3 days u will thank me and i would add voodoo juice are rizzatonic asap👍👍👍👍

Keep un mind that 5.2 pH is on the low side. A range of 5.5 to 6.5 pH is quite good, as long as it is in that range, you are good to go. Anyway, meassure your run off EC/PPM I assume the plant is taking more nutes than water, making the pH go up, as water pH is more alkaline. In other words the plant might need a stronger feeding.