dont forget also, your stomata close and open depending on your ambient temps and if theyre too low they wont open which means its impossible for your plant to uptake any kind of nutrients properly, Ive always maintained a temp between 78-85 degrees with lights on and CO2 enrichment occuring and...
ya dude you should be fine transplanting them as you stated, just make sure to water properly before transplanting so you reduce transplant shock and your roots stay nice and happy.
please stay away from fox farm,I can't count the times Ive seen shotty soil from their trash. roots organic is an awesome base, but you should just type in "subcool super soil" in the search man that stuff works something fierce.