I use the canna plus its good stuff mate, i take it your talkin about your runoff ppms ?? cos you'd just lower your feeds ppms right if to high? you need to stop worryin about the runoff, just shuck the stuff lol its all about what goes in in coco............ive never checked ppms or ec i try to read the plant, just start low with every thing and work up keep a eye out for burn.
so what size pot you in mate? it looks big? i think its holdin a lot of water in the bottom where theres not a lot of roots yet, and your thinkin its still heavy, if the plants droop maybe give a little of feed to wet the top area but no run off, then water for full runoff next feed, in coco your best in maybe 8-12L pots max or you cant water as much as you need imo. i use 6L airpots but you can use smaller with them cos you dont get root bound, im flowerin in a 1L airpot what i use for veg now, just to see how it goes lol