LSD 8 weeks flowering turning colors?

Lemon sour desiel clone has been flowering in foxfarm ocean forest under 250 watt HPS for 8 weeks.

For nutes iv been using Fox farm Tiger, Big Bloom,(using the chart starting w/ lower dose) and just have given it Cha ching twice 1/4 tsp per gallon, then stopped because of the discoloration of the top leaves, both my Platinum OG Kush and LSD. Then flushed and plain water as needed next watering just now.

Any comments, advice, tips, complaints, compliments it all helps. reps, more pics and info on my journal.
 

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