Will this be good for flower?

So i recently just chopped my first auto and harvested 3 ounces off her. The bud was so so. A lot of my friends liked it but i wasnt too pleased. I went with a simple ocean forest + perlite + basic plant fertilizer (jacks 2-1-2) and i really think i could do better. I currently have a few pretty large plants that are all root bound. I think im gonna stick 4 in the ground and i was considering using the same OF and perlite but adding happy frog tomato tone(7-4-5) and adding kelp meal. Any reccomendations or you guys think this should last me through flower?
 
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