Oh no! Help

[OctoberKing]

Pretty new to autoflowers and could sure use y'alls help.
I'm at day 25 on a Fastberry Auto. This is my second time growing the Fastberry and the first grow went beautifully. So there are two things I'm doing different this time and not sure if it's either or both that is responsible for the issues I'm having now. First is the media, I'm using Coco Loco, thought I'd try using coco coir. Second is I'm using Dutchmaster's Coco nutrients.
I've found out that the Coco Loco is amended so perhaps I'm over doing it with the nutes?
As you can see my leaves are extremely leathery, curling under and brittle.
So this is a first for me, hoping you good folks can help.

Thanks

 

[the green bandit]

Hey man, if you can copy/paste and fill in the patient help form below it will get you a lot better diagnosis. Also a full plant pic in good lighting will help
Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

 

[Waira]

we need info on the ppm's and pH going in, and coming out,... coco is not a true soil, and if you try to run it like it is, troubles will eventually show.... even the modest amending in there still makes this nearly straight coco, which there are a lot of do's and don't when running,... using Coco specific nutes helps a lot though!
coco is typically rujn more like hydro in some ways,... frequent mild feeding with lots of run-off, monitor pH and ppm going in and out to see if you're getting any nute build-up or off pH... It breathes and drains so well that water-logging isn't usually an worry...
More pics in normal light too please,.... has this weird crinkle texture been there all along? I ask because a fairly common mutation show brittle crinkled leaves, often with bitch nute sensitivity,....