If you want to up your yields organically you need big pots and lots of light. I've used a version of Subcool's super soil recipe with autos quite successfully, so if you're able to get those ingredients then you should be absolutely golden! I've heard nothing but good things about Biobizz light mix soil with autos, so that it would be an ideal substitute for Roots Organics. What is your pot size and current light set up?
Best of luck!
Best of luck!