Ye me to on both what your sayingI don't use Canna nutes but i would follow their recommendation and mix it to 1.1 EC. If you want to lower the EC just add a little tap water.
If your rooted clones look hungry or start showing slight deficiencies, bump up your EC.
In was use to sratt in 1.2 for few grows they sometime looked brill from the statt somerimes a little slow, but again I was soaking then put to run off from pot up ,
So I'll try setting like soil around the stem very other day or so till they root they 3 coco/pot out ,
And fewd 1.1 like the chart says
I water the again lasr nice before i went to bed just to make sure the coco as not to high in feed,
I fed no cal Just a&b and rootonic total 0.7 E.c to run off to flush thst 1.5 e.c I fed in few hours earlier I leave then dry now and water less till rooted the pot.