I strongly recommend adding a tablespoon or two of vegetable shortening (Crisco) when melting the chocolate. It does wonders for helping the chocolate stay smoother and makes dipping much, much easier. You don't have to go out and buy shortening for this, and in general, I don't like shortening. I always swap butter for shortening, even in recipes where it says to use shortening, but for dipping projects shortening is a huge help. I also recommend not melting all of the chocolate in one go. I heated half in the microwave with shortening, dipped half the discs; then finished the project by heating the remaining half. When working with melted chocolate and dipping projects, working in smaller batches proves easier so the chocolate doesn't start setting up and getting gloppy and hard to work with. Dip the discs, one by one, into the chocolate bath. I balance them with two forks, so the excess chocolate can drain off through the fork tines. Let the chocolate drain off well over the bowl before placing the disc on a parchment-lined baking sheet or large tray, otherwise you'll waste lots of chocolate to the parchment paper.