Hi- this is my first wine, but I have been homebrewing for 10+ years. The directions say to transfer the wine once it gets down to 1.040 or so, but to stir up all the sediment and transfer all of it along with the wine. What does this accomplish? Could I just stir up the sediment and leave it in the primary fermenter? It does say to leave behind raisins if the kit has them, but since this one has no raisins I don't see the point. Thanks!