Incorrect ph

it's more sensitive in flower. Any hint of an issue in vege becomes magnified. now, you are in soil.. what is the runoff? you may not have a pH issue. Just depends. ~7 in soil is fine. a little acidic is the goal.. ~6.5-6.8, but the right balance of nutes can work at 7 too. pH will impact availability. a new ratio is needed to maintain health. It's all relative, and most of the time it can work anywhere within range of common sense pH levels for you rmedium. i think i mentioned previously, but just in case -- i have a nute spreadsheet that will take your label %s and add them all up in ppm form for you. linked in my google drive that is provided in my GD comments section. p/k/s/mg/ca/mg/zn / ?? all can interfere with each other. pH can cause issies.. it's all three that matter. a happy medium at a fairly normal pH can be had, even at ~7.