I don't think EC is of any concern when growing in organic soil. I'd top dress with a healthy amount of worm castings and water in some kelp and molasses through it.
I had to break my tds meter out of a box at the bottom of my storage closet lol. I haven't used it in so long. But I decided I should get some idea of what the soil was putting out since it's a new adventure recycling this soil and it's at a new spot.
I was worried it was a bunch of Mg/Ca/other stuff precipitated out but I'm thinking it's residual molasses. The water comes with an almost burnt caramel hue. That stuff always sent the meter off the charts.
The plants are still looking good. Honestly, I think they were hungry. Even though I'm reusing this soil, I don't feed in the last couple weeks of flower and I didn't add anything to this when I put it back into service. So it's got to be devoid of nutes.
I had a tea running for ~30 hours prior to yesterday evening so I transplanted into bigger pots (nice white roots were growing down along the walls and bottom of the cups) and watered with some tea. It's a light tea. I'll hit them again with another tea if they show improvement, which I'm expecting. Let me snap more pics and i'll post them up.