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That is why I posted, you assume like I always did, to focus on N/P ratios, and that's not the whole story as I found out. The head chemist at Hydrodynamics Int. told me what was happening with the low ammoniacal nitrogen and said he was making a new formula for use with co2. That was years...

You're focusing too much on the nitrogen/phosphorus ratio. The ratio of nitrate nitrogen/ammoniacal nitrogen is more important. 3-12-6 has 0.7% ammoniacal nitrogen, that's a lot. I've grown with 3-12-6 hydroponic in rockwool slabs, with co2, for a long, long time. I never had a nitrogen...