Yes, the new train of thought is maxing EC in veg and walking down in flower. I'm kinda the same in that I max out in week 3 flower and walk down till chopping too. It's a natural decrease and means no need to flush either.
Funny, I've recently been having problems with popping in rockwool. My seedlings will sprout but then it seems like the stem withers up and the seedling dies. Maybe overwater? I keep it constantly moist with a dome
I just run a bubbler in my 50 gal rez to add a little extra oxygen as well. Dude have been talking about running a venturi instead, but i can't find one to buy and setup out of the box instead of making my own