Foliar feeding usualy prevents leaf drop durring flowering, had the same issue myself and a combination of Dutchmaster Penetrator and a good Grow-phase fertilizer. There is this stuff called green-stay but I have never used it myself:
http://www.bghydro.com/BGH/itemdesc....GGS025&eq=&Tp=

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Let me slip out of consciousness and into something a little more comfortable...