Molasses feeds the micro-organisms in the soil that benefit root development and health..I put about a teaspoon + per gallon throughout the lifecycle. (Flower included). General rule I've always followed is you need less N (nitrogen) more P (phosphorus) and Potasium during flower.
I grow all natural (organic) as well
I feed during veg a tea of E.B. Stone..Organic fish emulsion (4-1-1) with kelp and unsulphered molasses. I also have a good organic mix in my soil with a top dressing of worm castings.
For Flowering, Last year I switched to a diluted the mix of the fish emulsion and added Roots Organic Bat Guano (0-4-0) and molasses. I may do the same this year..last year I harvested 4+ pounds from 6 plants.
I'm careful not to wet the leaves as well.
Hope that helps some.