I use the GH phDown (phosphoric acid) for my 8.0 wellwater. 1/4 tsp per gallon drops the water down to 6.7ish. If you need phDown, you don't need phUp. (and vise-versa)

Would stop layering the components in your medium. The fine sand traps and holds moisture big-time.
The layering of ammendments will, as previously stated, burn the shit out of the plants, and ammending is really unnecessary with the Ocean Forest. (it already has earthworm castings, bat guano, Pacific Northwest sea-going fish and crab meal. Composted forest humus, sandy loam, and sphagnum peat moss) Ammending it further can have adverse effects unless you know how and why you are doing so. (perlite being an exception, depending on the season)

The Ocean Forrest is pre-buffered, so likely the runoff numbers the probe listed were bogus.

I add the drainage rocks to the drip tray, not inside the pot. Easier to stick your finger in the drain hole to determine moisture level, and allows more medium inside the pot for root growth. Tiz easier than picking the rocks during each transplant, too.

Doesn't GH put-out a ph test kit for water? Regardless...a good aquarium ph test kit costs $6 US, but is only good for clear water. They are no good for runoff because the tinting will screw-up the color-coded readings.
A ph pen is the best option and an invaluable tool. If you get the pen, you might also want to get the calibrating solution and the storage solution. (it's much easier than it sounds)

Terra cotta pots are ok for gardening, but the roots can and will find the little pores, (depending on the texture) making transplants a tad frustrating, and can be destructive to the rootball. Tiz a heavier pot to work with, too.

There is a schedule for Fox Farms nutes in my signature. Find it, download it, print it. Feeding should be happening once a week, so no...you are not following the schedule. Plain, properly ph'd water between feedings if necessary.

Lay-off the Beastie Blooms till you get your shit back in line. The FF solubles should only be used on a healthy plant free of other stressors. Otherwise it can do more harm than good. The solubles are quite strong, so use care regardless.

What do the 'little bastards' look like, and where on the plant are you finding them?

Slow down, take a deep breath, and keep learnin. :thumbsup: