if you're having burn problems, best to take a step back and use soils with less in them in the way of nutes
i have seen organic plant foods in the local stores, walmart, lowes, etc. that you could add low and build up gradual
i think what you are looking for is a 'super soil'. there are number of articles here on soils that grow from seedling to bud, just search on 'super soil', bunch of recipes for them