Coco is fairly simple.
I'm not familiar with that brand of coco, but you need to make sure it has been properly washed and buffered prior to use.
I buy my coco in 5kg bricks and reconstitute that in a tote. I run Jacks 3-2-1 in my systems, so I mix in 2g/gal Calcium Nitrate and 1g/gal Epsom Salt with enough water to cover the coco.
That sits overnight and is drained and dumped out on a tarp. I then mix in approx. 25% perlite.
Works every time.
I feed from the beginning @ 1.6ec.
I run dtw, so I find that in my 3 gal fabric bags I can feed to run-off once daily and the plants are quite happy.
It's ok to feed more frequently, the main thing you're trying to avoid is allowing the media to dry back.