My advice is forget about your measuring equipment almost completely. Fuck i only ph my water if ph below 6 or over 8, and i swear it doesnt matter if ph is within range, have tried different rooms recently. One with varied ph another one always at 6.4, no dif in anything. If youre mixing a decent soil and RECYCLING i really dont think it matters.
I just go by eye and smell and supplement with teas or top dressing. Ive recently started adding neem meal to water as its a very effective way to replenish N in the soil. I also topdress with a couple of inches of worm castings at beggining of flowering. My ec meters are kind of forgotten somewhere. Organics is really fucking easy half a dozen ammendments some molasses and just keep it simple.