There are so many differing opinions on annealing beads. The best thing to do is make sure the temperature doesn't go over the annealing range if you pile them on the floor, so the glass won't soften to the point it gets tiny nicks or kiss marks from touching the floor or each other. Certain colors are more apt to do this. Raku (Iris Orange) is one of them. IMO (and this is only my opinion!
), the best way to batch anneal beads is to stack them on mandrels, say 5 or 6 per mandrel, make sure they don't touch each other and lay the mandrels horizontally across a bead rack in the kiln. Starting at room temperature, SLOWLY bring the temperature up to annealing point.
As for the sharp bits at the ends of the holes -- make sure that when you start adding glass to the mandrel initially (when you first touch the glass to the mandrel) -- wrap a small amount of glass around the mandrel making sure to only touch the glass that is already there to make a small donut. In other words only touch the mandrel with the glass ONE time (the initial footprint) and then continue to wrap the glass onto itself as evenly as possible. Well, reading that it sounds kind of confusing.... maybe someone else can come up with a better suggestion!