Beerhunter CDN
Breaker of Colas
2ml per L is your half stregth? That is strong. Also, may I ask why you are watering around the stem? Roots SEEK moisture. Water around the OUTSIDE of the pot. Coco is like a sponge. Your outer edges look SUPER dry. Watering around the outside makes the roots grow faster, because they will seek moisture. Once you have good roots, water to run off.
I watered around the drip line of the plant with the thought that the roots would be seeking moisture. Now I know how I should be watering so I will water around the edges of the pot.