i have only recently switched to coco grows myself, and am using a 60/40 coco/clay pebbles mix which has very good (maybe too good?) drainage - doesn't hold much liquid but they have been happy up until now! my Samsquanch is 59 days old now. i LST'd this one much like you did with your AvT - no topping.
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Looking great man, why not pure Coco? Go pure Coco next time
Your Plant looks similar to my Baby it's looks we have same Pheno.
Cal deficiency you have but don't worry it isn't bad.