Molasses .. Does it work for a Bigger yield?

After reading this thread i would "think" that molasses would be most effective in the compost, prior to the plant(s) being placed into the prepared soil.

It also depends on what you're growing in. In a hydro, coco, rock wool etc type set up then molasses is pretty useless because you are using synthetic nutes to begin with. I'd use a bud hardener like Mendocino avalanche.