Problem child will NOT recover. Help.

[Little-Leopard]

As you can see in the pics, a few leaves are both cupped and clawed. I just cannot seem to get this plant in the right direction. Its growing incredibly fast, so fast that its outdoing the rest in the tent. I would still like to correct this problem though. I mix 5ml of CalMag per gallon RO water to a 150ppm, then GH micro, grow, bloom in the correct ratios for veg to a 600ppm. I PH to 6.3 and let it drift down to 6 before bringing it up to 6.3 again. It seems that the CalMag raises the nitrogen a little too high.

Add CalMag and avoid a CalMag deficiency in coco but get nitrogen toxicity. Reduce the CalMag and get yellow spotted leaves but avoid the nitrogen claw. It seems when using sufficient CalMag for coco one might need to avoid the GH Gro.

I'm thinking about using the 0-5-10 veg and 0-8-16 flower Lucas formula as its only Micro, Bloom, CalMag.

Any thoughts from the experts in this area would be appreciated. It may something else altogether.

I'm growing in Coco - Sweet Seeds Devils Cream - 23 days old.
Temps always between 25c and 27c
Humidity always between 50% and 70% depending on the time of day.
650w LED at 40% power. 20k lux at canopy / 420 umols / 20 hours on or 30DLI
Very gentle fan inside the tent.
I don't over water or underwater them...

 

[Rurumo]

What type of water are you using? You shouldn't need that much calmag with GH nutes, if any, unless using RO. I'd lower my EC to 1.0 and be sure to run plenty of extra solution through your pots when you see a problem like this. I think you'll see a quick improvement with a lighter feed. Also, how often do you feed?

 

[Little-Leopard]

What type of water are you using? You shouldn't need that much calmag with GH nutes, if any, unless using RO. I'd lower my EC to 1.0 and be sure to run plenty of extra solution through your pots when you see a problem like this. I think you'll see a quick improvement with a lighter feed. Also, how often do you feed?

RO water. (Edited above thank you) I've often had the CalMag deficiency in previous grows hence the added extra this time. I should also add that they are just over 3 weeks / 23 days old today.