Have you tried to make cake balls? Let's start with the name...as my cousin, Tara, wisely pointed out, "cake balls" is a little scary sounding. They are hereby renamed, "cake truffles." Much better! 
OK...I was getting a little frustrated because my cake, um, truffles weren't smooth like I'd seen on some other blogs. Mine tasted good, but they were lumpy.
These are Gingerbread Truffles (really yummy!) made with a gingerbread mix, baked and mixed with chocolate frosting. My A-HA! moment....shortening! I added a 1/2 teaspoon of Crisco to the melted candy melts and stirred until it melted into the chocolate. (I melted them in a bowl over barely simmering water.) 
Voila! Smoother coating...and much easier to work with! This time, I used a toothpick to dip the cake into the chocolate. This worked great, but I was left with an uncovered area on the top. My original idea was to flip it to be on the bottom, but that didn't work. Any suggestions? You can see how I covered it up with a dollop of chocolate on top and sprinkles. :) 
I'll be out-of-pocket for a while...a little traveling and moving (yay!) is keeping our December busy, so MERRY CHRISTMAS everyone!!! Have a wonderful holiday!
