Soil & Nutrient recommendations

I just recently transplanted my plants into larger containers using Kellogg potting (all organic) soil and they appear to be doing pretty good. It seems they have all the nutrients some of the really popular soils like fox farm, etc. are using. Im going to be transplanting some more plants soon and wonder if anyone has any good soil recommendations and should I still be using nutrients at this phase? Ive also mixed in a little blood meal and some kelp meal for extra nitrogen. (they are all about 6 weeks from seed and about a foot + tall) Thanks for looking