diagnosing leaf stress, burned tips and necrotic spots

Hey guys, I have been doing a bit of research on plants and diagnosing nutrient deficiencies. And I was wondering if you guys could help with some problems I have been having on one of my ladies.

Started about the time I switched the lights from 18/6 to 12/12. In soil, monitoring pH and keeping it around 6.3-6.5. Supplementing Sea-Mag, Calplex, and Molasses, and put High P guano in before I flipped the lights. All damage is seen on lowest growth, moving kinda inwards then upwards. Right now it's about mid-way up. Starts with yellowing of leaf (entire leaf not really veins or w/e) then pellet sized necrotic spots, then the whole leaf dries and crinkles savagely.

Maybe I missed a supplement or something, but here are the pics hopefully ya'll can help.

my apologies for the pics being kinda low quality, I haven't found my USB cam-computer cord.
 

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