Hey, I'm in coco and I use pk 13/14. When I hand feed I'll usually feed at.
Day 1 & 2 15ml to 10L
Day 3 straight water
Day 4 & 5 Dry out
Day 6 & 7 15ml to 10L
Hydro I just run it for six days at 10 ml to 10L
But depends on strain, the pk 13/14 will, if overused be noticeable the next day...