I changed up the ratios - instead of the 3:3:5:5 above, I used 2:1:1:2.67 - this results in something closer to a rum & Coke meets White Russian. There is still plenty of coffee liqueur flavor and cream mouthfeel, but I like the more prominent position of the rum and Coke.
A couple of notes - the recipe still calls for shaking the first 4 ingredients (apparently when you called for both milk and single cream). Also, the "Variant" list includes "Bulldog", which simply reloads this page (I suspect you meant to link to the Colorado Bulldog page).