Having some bad problems in flowering with Coco Fiber. Pics included!

It's been a long while since I've posted, but I do frequent RIU often. I usually don't have problems, but I recently switched to a different substrate and will eventually switch to different systems once I figure out my current problem with the coco fiber.

I've been using Canna Coco fiber and Canna Coco nutrients to try and grow some nice short-flowering-period ladies in 2 week rotations for the perpetual harvest. So far I love coco for cloning and for general ease of use, however I'm getting some really stunted bud growth along with some severe burning, twisting, and brittling of leaves towards the middle-to-end of flowering. I always adjust PH and though I use tap water, I've had success with it before so I know its not the water source. I'm thinking perhaps I'm not flushing enough and the Ph is too low or there's some type of nutrient lock? I know its gotta be something in the substrate just don't know what! Any help is greatly appreciated, thanks!
http://tinypic.com/r/vxojmo/7
http://tinypic.com/r/33nutfn/7
http://tinypic.com/r/2d0gf2q/7
http://tinypic.com/r/i4lgg4/7

I think we need some more specifics. Like what ph are you adjusting to? Are you adjusting before or after adding nutes? How much runoff are you getting when you water? What strength nutes are you useing? and ect. hope someone can help, those girls aint lookin too good.

WOW....all I can say is go back to what worked before cause the coco fiber or whatever it is is messing your plants up.

Check your nutes and the schedule of feeding and amount you feed, it looks like a sever case of nute burn IMO

This problem is way too far gone for you to repair.

What it is, is a phosphate deficiency. You starved your plant of the element, and maybe had some other problems like heat and pH imbalances.

Sorry man. Roasted plants.