Could you post a link to these vids? I took the hobby kit and fed my plants growing in coco 16ml/gal (full blast) base and the full 8ml/gal of B-52, Big Bud and Overdrive, fed daily and could NOT burn them. I measured 2.6 EC !! I used only the Hobby Pack and each time I mixed, PH was right there at 5.8. I am not saying anything about the PH in a recirculating scenario, never tried it. PH very well could go to hell in recirc.
I use it in recirculating Eb. I only use a Filter, not RO. Ledgrowing-PPM would only be high if your PPM out of your tap is high
mine is about 80, so its not bad at all. When I mix however I get more like 5.9-6.0 not 5.7
First run, I was all worried about it and tried to pH it. When you try to do this, the buffers go nuts and you have to use a shit ton of pH. I did not have a great run.
I called tech support and they said, stop pHing it, trust it. I was hesitant, but I stopped pHing. Run 2 was awesome.
For run 2
I topped off with half strength nutrients every other top off. This was key because it gets the buffers back into the mix. Your PPMs do run higher with pH Perfect, but like patlpp said, you won't burn. My PPM's are anywhere from an extra 150-200 all the way through, but no burn. Ive heard of people running it higher. AN recommends running it full strength.. I can't bring myself to do that, but I do run it 25% higher.
You run at least the hobbits bundle because your getting beneficials from Voodoo Juice, B52 gives you B vitamins, Fulvic, Chelated Calcium and kelp. Big Bud which is IMO best bloom booster on the market. Over drive which finishes things up nice in the last two weeks. You don't need much else, maybe Sensizym and Bud Candy.
I have added a few different products and it still works fine. You don't have to follow the bundles exactly as they say. The buffers are in the base. I imagine if you add other products with buffers or products that dramatically effect your pH, it would probably throw it off.
If you are going to use pH Perfect I would not even check your pH. Check your plants, they will tell you they are happy.