You said pH was the issue and it is. You can do whatever you want with ppm/ec, if your pH isn't good, nothing will grow well. Make pH of medium ~5.8-5.9, if you want healthy plants, runoff should never be more than ~0.5 off that, if it is, make adjustments so that it's not.
I always just used 1.3 ec, 1 bottle of general purpose nutes, start to finish, soil or coco and the plants grew very well. I don't monitor temps or humidity indoors and can't control it outdoors and the plants have never seemed to mind, they are much tougher than people, they are usually growing outdoors, in nature.