The grow formula is
2.6-1-1.5
And the bloom
2.5-2-2.3
Seems a little low and watered down to be honest.
6-8mls per litre of each during grow/bloom.
Personally in coco I like a lower K than P with higher N.
I am quite biased though as I love CANNA.
5-4-3 NPK from start to finish.
I max out around 45mls of A and B in 18L of water. That's about 2.5ml per litre of each of the 2parts.
I can't really find Ca and Mg levels of the vitalink which IMO are more crucial in coco.
Canna are 5% Ca and 2% Mg and even this isn't enough during flowering where I have to supplement Ca once a week at 0.8EC once the buffer has deminshed in the coco. Then I add extra Mg during PK weeks too to sustain optimum growth.
J