Yea man, sometimes I can't figure the shit out either lmao. Anytime there is something I can't explain, it has either been root issues or a nute lockout. But TYPICALLY, I know how much the ppm raised or dropped based on what the ph did. But its kinda plant specific. Like, for example, I'll know if the ph raised .1 on my wedding cake, that the ppm probably dropped 15 - 25 ppm. And then I know if I put 25 ppm nutes back into it, the ph would go back to where it was. But I can only really do this when my environment is consistent. Sorry, this probably makes no sense to anyone else... i'm pretty ate up from all the drugs