burn spots and bleaching? help!

What is this? In the pictures are 2 plants, both TGA Apollo 13-bx. I brought them outside to take the photos, but they're indoor plants.
I have 2 other Apollo and couple other TGA strains that don't have this problem.

Indoors
600w MH Vertical Bulb 8 inches from plant canopy.
Medium: Botanicare expanded coco blocks
Water: R.O water
Nutrients:
Botanicare CNS-17 Coco grow 4 tsp/gal,
Dyna-gro Pro-tekt 1/2 tsp / gal
Fed every other day.

PH: 5.5-6
Temp: 75-85F.

I've looked through several plant problem diagnostic threads but can't find any pictures that look like this, but I've found many descriptions that describe it so I'm not sure at all.

Also, does the new growth seem kind of funny? I Fimmed it and the new growth looks stubby / wrinkled / some have the claw which was more apparent this morning but disappeared for some reason.

Anyone know?

Potassium, bc it's on the edges there on the sides, but not necessarily at the leaf tip. Or a bug. Idk much about bugs tho.

ok that's not a bug, and judging by that horrible guess shows you probably know less than me.. thx for trying though.

guess I better ask Subcool or something.. where all the experts at?

You are on the very edge of being too close to the plants with your light, which causes bleaching of the leaves from too much light even when the temperature is ok. Push the light up 2 or three inches higher and u should be good to go.

ok thanks, that confirms it then.. someone said the same thing on icmag.