ALternating GROW Nutrients

Ok so I wanted to go completely Organic and natural this year. But I'm not the wealthiest person so Decided to just go with the nutrients I have. I have Foxfarm grow big and pure blend pro grow by botanicare.

My question: Would it be unwise/pointless to alternate the grow nutrients?
(One feed grow big, next feed botanicare?)

The reason I'm asking is Foxfarm GB is 6-4-4 and Botanicare is 3-4-5, just seems if you alternate it would give a better NPK ratio for cannabis. Or am I mistaken?
 
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