I've been making variations of this recipe for two years now. I use the measurements given here and experiment with different chocolates and liquors. I've made it with Malibu (dark chocolate ganache with Malibu rum, covered in white chocolate, rolled in coconut), Baileys (I usually use all milk chocolate), Pumpkin Spice Liquor (Hiram Walker Pumpkin Spice in white chocolate ganache, covered with dark chocolate). Mint (with creme de menthe or peppermint schnapps, crushed peppermints sprinkled on top). It's never ever been anything but delicious.
For even sizing and rounder shape, i recommend using a melon baller (I use the small end).