You shouldnt be PH'ing anything if you are 100% organic. I use GO personally, just started using it and I have to say I'm liking it. Especially the part where I dont need to stick my 5th PH meter into the mix and say "more PH U or D" and then repeat until I get it right.
Honestly, I have been just keeping a bucket of GO with an air stone in my setup/work area of my garden with GO nutes and some molasses on brew 24/7, pouring it into another 5 gallon bucket every day to keep it mixxed and for a little extra aeration, never once sticking a PH meter in there. Did I say I like the fact I'll never use a PH meter again? LOL
If you go with GO, you may want to grab the bio-marine, I am not fully experienced with it but from what I've been reading the extra N is more than likely going to be needed. Its also a good idea to amend your soil with some earth worm castings as well as anything else organic you can throw in there, it will only make the end result better.
As I said this is my first time using it but for my soil-less mix I went 45/45/10 with ocean forest/
happy frog/other.... other being lime, earthworm castings and some bone meal, but I wont be using that anymore unless its fish bone meal. I should have used some perlite but I didnt have any on hand and my grow shop was out so I had to use what I had but some perlite or rice hulls would have been a good thing for my mix.
Also, you will need the bio-bud for bloom if you do go with GO.
Let us know how you make out.
Good luck and Happy holidays.