Leaves rolling

I've seen this several times and would claim that it's due to the PK 13/14. I've read in several reports and also experienced it myself when I used PK 13/14 that the tips of the leaves stand up strongly at too high a dosage, similar to frizz in hair, and then they start to curl, and the tips become dry and brown.

HeatStress Solution •Lower room temperature •Move plants away from hot spots

Heat and light stress will cause the curl. When you cant control the this properly the plant needs more water to uptake.

I just read your diary and you have them on a 20.hr light schedual, this is likely your issue, your DLI is way off and your VPD is a bit off at 1.19 and it should be between 0.96 and 1.15 you're in to the stress range of the VPD chart and ill venture a guess that they're not on a proper watering schedual either, over watering is what ill lean towards, let them dry up a bit change your light schedual to 18/6 and lower your temp by 1c or raise your humidity up 1% to get you right in the sweet spot of the VPD chart at 1.12 and see of those slight changes make a difference and cut back on the water...See what happens in 24 for 48 hours and if nothing changes let us know...but I think those changes will make a difference

Leaves curling upwards: it could be a sign of potassium deficiency or overwatering. If you're watering a lot, let the substrate dry out for 1 or 2 days. I also see in your diary that the pH is at 5.8. Raise your pH to 6.5 so your plant has access to potassium. Check those 2 things: the pH and your watering. Good luck!

Hey buddy! Maybe over-fertilization has caused this problem. If that's the case, it would be good to do a thorough root cleaning with plenty of water!!