Thanks for the chart - good info.

I fail to see how your math works though.
This is the plants' first week (the feed amount is for day 1, when they went into the reservoir.)
According to your chart, I should be using 2.0g per gallon (is this a US gallon or an imperial gallon???)
If it's a US gallon, then 1 gallon = 3.785411784 litres.
2/3.785411784 = 0.5283441047162968g per Litre.
I used 0.4535714285714286g per litre.
That's only about 12% less than you have in your chart.
I am using Tap Water for the base with 200(ish) ppm, and am sitting at about 330ppm. Any higher may not be a good idea for seedlings.