Nutrient Schedule??

I'm lazy and just bought premixed generic nutes on ebay of 20-20-20 and 10-30-20. I am limited to a small space, thus I am planning on vegetating for 2.5-3 weeks. Then go to 12/12 thus keeping the plants smaller. Should I not even bother with the 20-20-20 and use the 10-30-20 at half strength? My soil right now is 6.8 ph and I heard that the 10-30-20 can also bring it down.
 
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