zat,
weighing the wet weight will include entire branches... what I have always done is taken the total weight removed 15%, this took care of majority if not all or more of the branch weight. so if you weighed everythign and had 400g's I would would take off 15% (60g) and say wet weight was 340g. As stated by claude bawls buds will lose about 75% of their weight in drying and curing. if you had calculated 360g wet you can be pretty close to 90g dry.