Morning Diggs,
Wrote you a garbled stoned message last night and forgot to hit "send". You're probably better off not getting it. lol
Maybe try and look at watering from two different perspectives. Early on in vegging...the goal is to get good root development. Wet/dry cycles are best for that. But even with small veg plants...you should water to get maybe 10 to 20% runoff... salts will accumulate.
It's been my experience that if you aren't watering to runoff...salts will build up even at a modest feeding level. And when you have excess salts in the rootzone...and then let it dry...then those chemicals with precipitate out and remain toxifying your rootzone (usually by lowering the ph) This is why toxified plants have similar leaf damage as ph issues...because that's the main issue with salt build-up. Well that plus other nute element lockout..
It is called a "drain to waste" system of growing because of the runoff. The best coco growers know their plants and media well enough that sometimes they don't have to do that so often.
At a bare minimum, you should water to excess and measure runoff ppm and ph weekly. Runoff should be less then 100ppm higher then nutes that went in. The rest of the time...water till you have just enough runoff to know the coco is all wet.
And if all of your plants are fairly similar...you may not need to actually measure runoff on all of them. Just do a couple plants.
Later,
JD