You need your ppm nearer 1000.
The
Canna webiste shows around that.
If you are NOT adding the additives, you still need a ppm of 900-1000, so add more a and b until you get to there.
I use Canna. Canna Aqua, for hydro. I also add some additives.
Cal/mag
13/14PK for flowering in week 4 of flower
BOOST for flower size and taste. Expensive. I use in the 1st month of flower only.
I use ROOT66 from Technaflora for rooting as I have it laying around and it is $$ so I use it.