If you buy AN you are supporting a child rapist and gangster. Fuck AN, they are everything that is wrong with the Cannabis industry. IF you care at all about the people behind the things you buy then look into if not buy their shit and throw your money away.
My advice is return that shit. For synthetics go buy a tub of 20-20-20 from Home Depot or a store like it. There's no reason to use anything else. Salts are salts are salts are salts. You're paying 270$ for mostly water with that AN shit, I'll never us a liquid fert again other then Cal/mag or Silica (Only because that's how they come). Waste of money to pay for water, I have water.
But I'd rather you fix your organic issues
, what soil mix are you using subs? It's been known to be SUPER hot and way expensive. If you use 3 cups of balanced amendments per cubic foot of soil, pretty sure that's like 7.5 litres if memory serves look into that, you will have a much lighter mix then subs. The key is balancing out your amendments, all I use is Blood-Bone-Kelp-Alfalfa-Volcanic Rock dust and a tonne of EWC (Not literally but it's about 30-50% of my mix) You don't need to source a tonne of rare minerals from all over the place. Also look into microbe teas they are super easy and can fix some issues pretty quickly.
Pictures of the N.Tox would help