Regarding the prior comments: Choose your rye carefully; WhistlePig 10 years and Templeton 4 years are light in flavor and sweet. Templeton 6 years, Wild Turkey and Knob Creek, however, have more body and different flavors. The rye you choose will have a defining impact on the taste of this drink.
Choose carefully, also, your vermouth. Antica Formula is my favorite vermouth. I used, however, Vermut Negre, a dark but not too sweet vermouth. I then used only two drops of Xocolatl Mole, not three, which was fine for me. This was the first time I drank this cocktail, but I humbly rank the resultant cocktail at 4.5. I hope my suggestions are helpful.