I note you have given the times that you are dosing but have you ever checked the volume that is actually being delivered per dose? Even precision dosers can vary, I would check this to make sure. With your system you may have to alter the time of dosing for each product to make sure it is delivering exactly what you want.
I worked with a computer controlled nutrient delivery system for my Masters and had to check delivery of each channel before every experiment (180 channels) and input into the computer to ensure even dosing across the system.
Anyway I hope you figure it out.
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