Your coco just had a large dryback, because you missed a day fertigating, causing the EC in your coco to spike. You’re not over feeding them unless those burnt tips were there before the missed fertigation day. It also causes the pH to get out of the norm and cause other little leaf marks from uptake availability issues. Lucky person living in Sweden. Best of luck finishing them off!!
Looks pretty darn close. Can you get a jewelers loupe or digital microscope? I’d grab a loupe or strong magnifying glass and check the trichomes. Looking for mostly milky looking trichomes.
The Cannatrol works from everything I’ve read but is 100% overpriced. I’m glad that the company that makes it takes care of their workers and I wish them the best but can’t justify that cost when other drying methods work very well for almost nothing. I’m still green (new) but have one hang dry under my belt now and it wasn’t that bad.
On making carts, the investment there is high I’m pretty sure unless you go a hair-straightener route which I’m unsure of.
In any case, welcome to OG!
You’ll also find a few threads of interest if you search for Cannatrol — this has definitely been talked about :).