tampahydro,
I've been looking for organic nuts mixes.
Would you post the formula from GE.

Thanks.

7.6 is much too high for most plants. You've got to get it down at least a full point or most anything is going to die. Tomatoes and other acidic plants will need even lower.

My advice would be to get a real hydroponic pH down, like the one from Advanced Nutrients. It'll have the power to really punch the number down and the buffering agents to help hold it there. But it's possible your organic blend is just going to keep overpowering all your efforts to the contrary and keep killing your plants.

It's easy to use organics in soil because the soil already has strong buffering capacity in it.

What I'd do is to mix up the ingredients separately and test each one to see where your crazy alkaline pH is coming from. Then don't use that, or find a better alternative.

Testing equipment doesn't have to be complicated, but you do need some way of reading values between say 5.5 and 7.5 with reasonable accuracy.

If you want to save yourself the trouble you might want to look into some pre-mix organic nutrients that are specially formulated to produce stable pH numbers and perform in hydroponics. (A common problem with organic hydroponics is clogging and stinking.) I've got a link below to the product page at AN's website - they've got great organics and the pH down is there too.

Here is a link that might be useful: Advance Nutrients Stuff