I never test my runoff neither. Always keep in check what I put in. I believe to answer this question best is to determine if the soil you are using has Nutes in it already? I know u said happy frog and roots organic, but are they already full of Nutes? If so, feeding anything extra is kind of an overkill. Just ph’d water is all you need, and maybe occasionally molasses here and there, ( unsulphured blackstrap ). If they don’t have Nutes, and you are only feeding once a week, I think you’re starving the poor girl/girls a bit. Water/feed/water/feed is a good schedule in my past grows.
I’m strictly soil with dry amendments now. No hassle with measuring Nutes, I got tired of that. Now it’s just ph’d water with Calmag and I’m good. Of course I still have to ph my water but that’s about as technical as it gets.