So even you realize that the ppm diff is a problem..
So here is your biggest downfall Wood... You dont have a ro filter, and you are handcuffed to making water last as long as you can..
So really your next purchase should be an RO filter.. Hell I only have a 100 one that does 50 gal a day.. For you that is way more than you need but that is the cheapest..
You need to make up 3 gallons of RO water and 5ml of grow,, Ph that to 5.8.. put 3 cups worth off to the side.
feed the rest of that to the sour jack.. over the sink, tub, bucket, toilet, etc..
go slow and it does get tiring..
We are gonna flush the plant and reset the cation exchange..
We are now utilizing the properties of coco, that make it so great..
We can erase the bad, and get started with the good, ASAP....
After you have ran all that thru it, run the last 3 cups thru it over something you can collect it in, and measure it again?
Always measure what goes in, to collaborate with what comes out.. Im only worried about ppm, but since ph is just as easy, you can throw it in there too..
After we confirm we are down around 500 or less, you will hook it back up, and let it run at 650 ppm and 5.8..
And then we need to compare compare the run off from one plant to the other.. I feel for some reason, the sour jack coco isnt acting right. I think its drying out. We gonna flush it hard, and reset the cation exchange.
Do you have any calimag?