Seems good. You should be able to estimate the EC without a meter. 1g/l usually gives around 1.2-1.4 extra ec, and 2g/l around 2.5. For young plants you want to stay somewhat low, under 1g/l I would say.
Maybe there is online an analysis of your tap water. That would help to see the starting EC, by the amount of phosphoric acid (60%?) it seems not to be too high. For your water I would have used something with less nitrate, probaly a 60% ammonium would have been better to keep the pH more stable in the media.
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