help possible nute burn?

[Masterkush528]

fed yesterday at ec.1.1 ph 5.5 run off was ec 0.9 ph 7.0

the ph is not coming down at all.

now the leaves have started yellowing quite abit alot worse then before.

any ideas?

 

[Masterkush528]

more pics

 

[Masterkush528]

and more pics

 

[budlover123]

I've seen very similar results from too high powered lights for the room, imo less is more some time, check out some of VerdantGreens 250 HPS grows that are extremely good. It might be nutrient related, but its very hard to dial in the nutrients with high powered lights, and even 400-watts is crazy powerful.