I have a problem getting my head around few things in all this.
The saturation point and the drainage point = the moisture volume left in the medium after a cycle.
IF one guy can get great results with a Perlite mix and the next guy the same with pure Coco, that kinda says to me that the saturation point has got to a fairly wide variable, and the plant doesn't need it to be precise, but it needs frequency to keep it stable and oxygenated.
Im thinking if the plant is adapted with a good root system to cocos full saturation limit, then you can feed near on continuously, so Im thinking the percent of runoff doesn't really matter, and it is better to have more frequent and longer exchanges of air-nutrients than shorter ones, and drippers on a short cycle is going to channel through the container instead of spreading moisture through the medium.
Had a friend who had to go away for 5wks the day after he flicked his grow to 12/12 , set them up on 500gal recycling tank of nuts and when he came back to his surprise they were beauties, he was in 20-liter pure coco 4 drippers in each and the timer had failed with the feed pump on 24/7 didn't hurt a thing.