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I happen to respect the growin abilities of the ppl I am in disagreement with so I want you to know this IS NOT PERSONAL!! ;+}
From Canna's web site... dealing with def. in coco substrate:
Progression of symptoms in chronological order: Potassium shortage:
In the beginning, you see a healthy looking dark green plant with normal glossy leaves. The leaves lose their lustre later on.
The plants often have more branches. but the stalks remain thin
the tips of the younger leaves show grey edges: later they trurn rust brown and CURL UP AND DRY OUT
The leaves turn yellow from the edge in the direction fo the veins and rusty coloured dead spots appear in the leaves
The tops of the leaves CURL UP RADIALLY and whole sections of the leaves begin to rot. The leaves keep on CURLING and ultimately fall off OLDER LEAVES.
you are using straight coco? I would use a coco specific fert... Canna coco works quite well and you won't see those problems if you use it as directed..
Also AN's Connisseour works fine in coco too... I should say SO FAR.. 3 wks into 12/12 it works fine.. I have also heard that PBP works great and for that matter GratfulHead grows in coco and has his own fert mix that WORKS FINE TOO!!!
I've also hear wonderful things about Hesi and House n Garden coco specific ferts!
I would change ferts... You could also try adding an additive like AN's Bigbud this would also help with any MG def you might have going on as Bigbud has lots of Mg in it too.. I agree there may be a cal/mag issue in your garden too but I think primarily your lacking sufficeint K.
I wouldn't add PK 13/14 because of how early you need it...
I haven't grown in dirt in years so I don't want to venture advice there... If you were adding BigBud during your flowering and your plants still had those problems.... You had more than a K def going on... you had a K lockout... There is NO REASON with your fert numbers and then in addition adding bigbud.. that you should have a K def.. unless your PH got out of whack....