Help! Can't identify issue with sick plant. Top leaves discolouring from the tips, rust spots and canoeing.

It’s looking like a slight all around deficiency with possible medium PH being too low. Shoot for a 6.2 and give the plant a couple of good teas. This will flush and then start with the nutrients. Remember that it takes 2 weeks for them to show you the problem and another 2 weeks for it to have been fixed. Good luck ✌️💚🌿💨

The discoloration and slow growth here is due to a potassium deficiency... check your pH (I don't see any info in your diary about the pH)... it needs to be between 6.2 and 6.5 to best allow the plant to absorb the potassium that she's being given ... I worry a bit when you say she's getting "NPK traces" - she needs a lot more than that, particularly the P and the K.... but check your pH first... that's usually the culprit. Good luck!

More info: I’m currently growing three dutch passion white widow plants inside a 2x2 tent under a 120w led with a good exhaust and oscillating fan. They’re in 3gal pots filled with 80% peat moss, 20% vermiculate + NPK traces, EC = 0,7. On top of that, I've added the following amendments: 10% worm castings and 18 grams of cockroach castings, 18 grams of mealworm castings and 18 grams of bokashi. I’m using a local organic fertiliser which has always worked out perfectly from veg to flower in all of my runs. Symptoms are limited to top/new growth: leaves discolouring from the tips, rust/brown spots in a few leaves, leaves canoeing/tacoing, slow growth. I’m thinking this could be a sign of deficiency, but I’ve raised the fertiliser dose and it hasn’t really stopped. I’m pretty sure the watering schedule is fine since I’m relatively experienced and this isn’t something I’ve got wrong in a long time. Most people seem to think it's a magnesium deficiency, but I thought mg deficiencies were supposed to start from older leaves, progressing upwards as it gets worse. This issue has started from the canopy and is, apparently, progressing down. I've raised the light a bit and the plant is praying again, but leaves seem to be discolouring still. That aside everything looks good, so I’m stumped as for what to do to rectify this issue. Any help will be GREATLY appreciated! Thank you!