I've grown a lot in a constant-flood gravel bed, which is basically DWC with a support structure. That support structure (all the gravel) allows for growing big heavy things that utilize the gravel as an anchor to keep themselves upright. My fastest growing, most productive trees grow in-'ground' in my constant-flood gravel bed.
I don't grow hydroponically, only aquaponically (with fish). I don't track things like EC and nutrient levels, so I can't offer any precise help in that regard. I can say from experience that my fishy water won't burn my cuttings, and that a tub full of fertilizer water (initially prepared for a different purpose) burned/fried/dissolved the cuttings I put in it, but I don't have any experience in between those two extremes.
Here's a pic from a few years ago so folks can see what my gravel growbed looks like. The water is always around 8" deep in there, and well oxygenated. The fig tree in this pic is a Black Mission tc that never fruited (I allowed it to grow another year after this pic was taken, and it remained barren, so I replaced it with trees that were immediately productive). Nowadays this tunnel has several in-ground trees that do very well and are very productive (Hardy Chicago, Alma, and LSU Gold), and this is also where I stick a lot of my young potted figs.