Im not sure how much they swell, its my first time using it. I always used just carbo load for more frosting on the bud, but I will see how it does. My girls come down in about 3-4 weeks so I will take a pic and post the weight I get.
For me it depends how often your feeding molassas. Some people feed every other feeding (1.5-2tspb/ 1gallon) Or every watering at 2tsp - 1tsbp per gallon.
I wouldn't exceed that too much