My son who is an Top notch grower used coco for 2 grows then gave up on it because my 'secret' homemade compost out performed on the big eating Blueberry's we were growing at the time.
Then he switched to hydroponics and outperformed me big time.
I've now switched to hydro also...
Its actually easier to do than you'd think.
From the pics I'd say you doing very well.
...and even the wife likes that sazzy Fertilizer chart,,