fertilizer question

just bought jacks classic orchid liquid 3-9-6. it says to use a 1/2 capeful. I noticed everyone is using higher strength ferts. question is can i double the strength it would make it 6-18-12? am i correct on this.in mg organic potting soil. havent used any ferts except molasses.2 months old just put in to flower.thanks guys for any info peace
 
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