Possible light burn?

Noticing burnt tips and slight "burn look" to some leaves. Some leaves are curling down. Pistils are still not browning. anything I should try?
Week 8 flower
Strain humboldt sour diesel
Light platnium led 450 about a foot above top cola ( cant get higher and probably to late to break or bend and the closest nug still looks healthy its actually the shorter ones showing issues,)
Coco medium 7 gal pot
Temp 74 f
Humidity 49%
Using supernatural nutrients
Never grown this strain, read it was a 65 day finisher but at this rate there's no way
Coco is pretty dry maybe I should up the feed schedule? Currently runs 4 hoses 1 time per day for 1 min
Thanks for the help

Leaves look really green and shiny. A sign of a lot of N. Also the burnt tips. Tone the strength down of your nutes down.

Currently using 17-101-49 I will say I am shocked the plant isnt more yellow by now. Maybe I didn't get a good enough flush in between cycles. Thanks for the help.