When you clip the plants a lot of metobolic reactions change, considering I could smell my plants in my front yard once I clipped and hung them you would of thought the entire house would have stunk up but that didn't happen. I believe the strong aroma they produce while growing is a defense mechanism, once you kill the plant it can't produce this any longer and the components begin to break down and change their chemical composition. I believe the aroma is concentrated around the center of the bud so while you cure it it can get stronger.