well sweet does not replace molasses, it's just a carb synth agent... giving molasses AND sweet gives sugars AND the ability to incorporate them into budmass....you're late! Get on top of it lol!!!! You should give carbs from the start of flowering and I even give some in veg!
about a teaspoon-tablespoon per gallon of unsulfured molasses. Also sweet supposedly stabilizes pH something fierce so it might help you!