the problem is not with you or your water bro its the soil. you need a bloom top coating or light light hit of bloom with a small touch of N. thats why I like granules for this sometimes,although soluble or liquid is best for this imho.
the KS is a solid product BUT , the flaw is with the recipe. when I did the t est it was juuust about perfect except for some aggression scorching n so on.
with ALL others I grew After the test,each and every one exhibited this.so whats that tell you guys? its either unworked,balance is off,OR which the quality control has gone out the window. he really needs to get a handle on it or its gonna break him man. shame too cuz my plant(which im convinced was from an earlier run of soil/separate recipe even) did exceedingly well and not even I could get another plant to grow that well and I bought a few pounds to figure it out. nadda single one did worth a damn. pissed me off flatly. i was NOT happy and am still not. i hit him up trying to tell him he needs to bloom them out with some longer sustained Nitrogen and more of botgh types of bloom foods.
PH water is fine but its a temporary thing. Little life left if any and problably zero to very little lime left to help the non existent life buffer your soil.THAt is why its failing,it aint you bro,its them. you have to limp across the finish line.
I can assure you it IS NOT you broseph