Hey @cdnBuddy, it sounds like you've been chasing pH for quite a while. I read through a lot of your thread and didn't see you mention what your water situation is. Is it well water or city/municipal water? What's the starting pH (out of the tap)?
When I was successfully growing in soil, I had city water. I assumed it was pH neutral and had calcium and magnesium in it. I also assume it had chlorine in it, so before I used it, I would let it sit out for days before using it, allowing the chlorine to evaporate. I literally never measured the pH of my water and never had issues with my soil grows. Then I moved to a home with well water and everything changed.
In my new location, my well water was pristine. I sent it out for testing and the PPM came back at ZERO! Unfortunately, it was not potable due to the extremely low pH (like, 4.8 or 4.9!!). I had no idea how bad this was going to be for my soil grows, but it was horrible. Even though my water tested as pure, the testing did not pick up the copper that was being leached from my water lines. Copper kills roots and it builds up in soil, so the soil becomes a toxic, untenable medium for growing anything in a container.
I installed a whole-house chemical injection system, which injects a potash solution into my water as it was going into the pressure tank. This helped get my water to a potable level and stopped the leaching from the copper pipes, but ultimately, I learned that my soil method would not work with my water.
I chased pH and new methods for more than a year, eventually going with a hydroponic setup and installing a reverse osmosis system for my water. My R/O water was still very acidic (low pH), but it was also pure and without any copper.
I continued to chase pH and it continued to be elusive, but my grows were getting better, so I stuck with my hydro setup and tried a variety of nutes. I ultimately tried "House and Garden" nutes and loved them. Then I tried House and Garden nutes without doing anything about my pH - and BINGO! I literally stopped caring about my pH or PPM. I just stuck with their feeding schedule, added some cal/mag to the water, and flushed with only water for the last week or 2 of each grow.
Perhaps I would have the same consistent results with another brand of nutes, but once I corrected my water issues, then hit the jackpot with House and Garden, I stopped looking. My point is more that the water might be your issue. You need to understand what you're starting with and get that dialed in before you chase your tail and hope to catch it.