maybe u could try useing a more complete fertilizer that has everythig in it.useing indervidual fertilizers eg mixing the opropriet amounts can be hard if u use to much phosherous this can kill usualy phospherus is present in small amounts.u should look for a fertilizer that has a good N.P.K ratio with all the micro nutrients.I use a good two part grow fert when in veg stage and a two part flower fert for buding ,i suplement the flower fert every couple of weeks with with extra phospherus but more importantly potasium . happy growing........