We call that pebble rash. It's not usually that bad, but I see it quite often before they get a hold. It's a few deficiencies together.
Is that ec 0.32 because that sounds like RO to me. It's hurting my head thinking about it. They can't grow on that.
That's in addition to the pH issue
No offense to anyone, but when I used Advanced Nutrients years back when they first came out I had a lot of problems. At that time I had two friends trying it too, one was using Grodan Rockwool and the other was using a recirculating hydroponic system, I was using Promix peat. We had hell and couldn't seem to hit the mark with nutrient absorption and pH. They say don't use your pH meter with Advanced Nutrients because it's pH safe and if you use a meter you will get confused. All three type of crops failed and was aborted, so we switched back to General Hydroponic's and haven't looked back. The sad part besides losing the 3 crops, is all 3 of us spent over $100.00 each for their complete nutrient packs only to throw them in the trash. If you check the Amazon 1 star reviews you will see other complaints too.