the dead suger leaves is a bit disconerting..
as long as you don't have some infection causing that, it's fine. when you harvest inspect under those buds. make sure there is no white or grey fuzz. if so, throw it out.
if they died by natural causes, you'd have to look back at how it progressed, the way-too-late-to-do-anything photo doesn't help much.
looks like they went downhill after you switch to "kablooey" or whatever that product is called. Rapid starting about 2-3 weeks after you started using it, based on diary info. overdosed it with something in that product, i bet.. unlike common belief, bombarding a plant with p and k is not magic. if you look up the ingredients then compare to some similar product, i bet thy overchaged for ubiquitous ingredients, too. neat lookin label though.