"Claw" Leaves Around Buds! Need some help please!

Afghan Kush Ryder Autoflower Fem
Fox Farm Nutes 50 % recommended dosage (gunshy after previous nute burn)
400hps + 400mh ... 20/4
water temp 65 ....air temp 75 - 85
Week # 6
After rez change I added 1st dose of Tiger Bloom (at 50%) and plant has stalled out with no new veg and "claw" leaves beginning around the buds. Have another plant in same cooler which grew approx 4" in the past week - looking good.
The "claws" started at the top bud then continued to the rest. From everything I read it sounds like nute shortage or maybe shitty FF Tiger Bloom. Looking for some help!
PH - 5.8
Leaves are all dark green with no visual yellow/burn marks. Red/brown colors in pics from hps/mh lights.View attachment 1455237View attachment 1455238View attachment 1455239View attachment 1455240View attachment 1455241

cut the nutes down to 1/4 ..feed them strait water for 1-2 weeks first to clear them out..some strains take nutes better then others,i've even had clones form the same plant act different because of the pheno-type that becomes dominant...

The only thing i can think of is your ventilation, the rest of what your doing looks good and they dont look burnt to me.