To me .... adding this and that will NOT get you greater product ... you could throw molasses , unicorn piss and whatever at a plant and will mean nothing if you are running shitty genetics.
Adding molasses is the cheapest alternative to those retail products - which ironically have molasses in them . You can get the same effect from honey and assorted simple sugars . Soils are the best medium for these but thru personal experience it added no benefit . As long as you have a thriving soil you are set. It makes ZERO sense to do multi bottle feeds on ANY plant . I kicked FF to the curb ( i still have a little left ) for much SIMPLER nute lines ( 2 or 3 part mixes ).
Dynagro / GH are easy to use and erases the confusion. I use DR. EARTH -(3/3/3 ) for grows in veg and then use maxibloom for flower Dr. Earth also has a great bloom agent called : Flower Girl.
If your medium Is light and not very ammended , then FF shines but if you are running a more complete soil mix , it will be too hot to use in most conditions unless you start very light (1/4 - 1/2 strength ). Even the DR. Earth " liquid solution " has 2% molasses already in it. Dynagro is another very complete ( no brainer ) feed ... i mix one capful per gallon water - it buffers my tap water to 6.5 and rarely have to adjust. It works beautifully for my hempy grows.
Keep shit simple ...