PH problem

Oh I do it because for first 3 weeks I water only a bit, so there is no run off.

Lemon kick its a product from a brand, i am checking ec and pH with adwa pen. I will change a soil i guess

I found two brands on this platform which i would never recommend to use. Maybe its my superstition, but plagron is one of them. To be fair, light mix by biobizz, was worst soil i used too .... I have big suspicion about low fat food for humans, looks like same result for weed too ... And you gave answer, if after first feed you got such results, search no more whom to blame. I was very strick with ph, for soil it was always 6.3, but my run off was usually a bit higher too, sometimes reaching 7.0. 6.5-6.8 mostly. Get ec and ppm meter too, that way you wont have overdose. Lemon juice is very unstable, unless its some product name. Used ph +- from dutch passion and later organic from biobizz, both did job perfect.

Yes I do drying periodes. of course I measure as a last thing. I use plagron pH minus and lemon kick. I fed only once on 27 Day, still burned leaf ends appeared, two days later pH sky high

Bad watering regime, when you have no dry/wet/dry/wet cycles can play with ph. Excessive nutrition in soil can play too. When you measure ph ? Its should be last adjustments before watering your plants , aka all nutrition and other food is already mixed in. How you regulate your ph ? All hippy remedies are not stable. Ph +- by solid company is only way.