Plant dying

I have spent hours reading through diagnostic guides and whatnot, but cant cant find anything that has been of use thus far...

Plant was week or two from flowering when problems started, currently it is in the 4th week.

Leaves are dry thin. Tips turning brown, then edges, then death. The bottom 1/4 the plant is completely brown and shriveled, dead and gone in some places. The tips curl downward, as do the edges of the leaves. Nutes cut for a week or so, but the condition just keeps progressing. Soil is also staying moist below the surface for much longer.

The plant was still dark green when symptoms began, about a month ago. The addition of miracle grow flower booster began to correct it,but a few weeks later it got worse so nutes were stopped. It continued to get worse so nutes were added back in small amounts this past feeding but it continues to look worse.
 
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