So my understanding is that if you add the PH+ stuff to a solution that already has nutrients in it, it can cause some of the nutrients to fall out into a condensate. (). You can add the PH stuff at any point in the mixing, but if you add it at the end, you have to dilute it down. Like, a tablespoon of solution in a couple cups of plain water. Then use that diluted solution to PH your nutrients.
So what I did was mix a batch (PowerSI then Part 1 then Magnesium Sulfate then Calcium Nitrate then Mr, Fulvic. Then I PH the whole bucket. Once I have my PH at 6.5, I feed. But once you know how much PH adjustment you are going to need for YOUR nutrient solution, you can now just get your bucket of water, add the PH amount you established earlier without needing to get a second container to dilute it, then add your nutrients as usual.
And am I reading this correctly, you are using Fox Farm
Tiger Bloom in ADDITION to the Jack's 321 nutrients?