Do not get confused with the math, just follow the directions, add 2-3x a week the dry ferts, maybe make a liquid trace, dose that 3-5x a week etc. that's it. It'll soon be boring and routine.
In practice, there is no planted take that makes or breaks with some very careful precise metered like dosing routine. So do not worry about it, just add them as routine as you will.
The old days, folks use to claim the the careful dosing was some secret to algae, which was/is manure. So there are some that still believe it, or that there's something to it still, even after being resoundingly falsified over and over.
This is not about belief. EI does not care about that.
All it does is provide in accordance with Liebig's Law,a non limiting amount of ferts for 99%-99.9% of planted tanks.
You dose 2-4 things, that's it.
Most planted hobbyist got into the hobby mostly from the fish side of the hobby. We wanted a nice planted garden and something that looks nice. We did not get into the hobby to test PO4, NO3, pH etc.
I do not test this stuff any longer. I had to convince myself that it did not matter. I have the background to to know what I dosed and measured, but my goal was not really to do that, but rather, to garden and scape nice planted Dutch tanks. Amano was not around back then in the English speaking scene.
So do not lose sight of your original goal. A little bit of testing when done right, it can be useful, KH test kits(Lamotte are excellent) and pH meters are the most useful. Knowing what the tap water source is and the water report is also very helpful. I doubt you need more than that.
You can if you want.........but it will not help in any significant way for the gardening and goal.