I use Ms.Delta soil that is very fertile, that doesn't need any nutrients, it's very similar to KindSoil. Just water.
I do add perlite though, 20-30percent.
I start adding unsulfered molasses when my plants are about 2-3weeks old, 1tablespoon a gallon early on, then 2tablespoons the last month or so.
Molasses is good stuff, lots of good stuff in it, plus it keeps your soil fresh by feeding all the goodies in your soil.
Plus ,this is just my opinion but I think it really helps swell your buds up and helps them put on more weight, the last 2-3weeks before harvest.
The few times over the years that I have used other stuff like coco, or ffof, and store bought nutrients ,i used the molasses the same way, it was added last, but I don't think it matters though, but it will raise your ph some, so watch that.
Good Luck and HappyGrowing.