I’ve tried this with a quite potent homemade dram (plantation 3 and o.f.t.d.). The first time I made it I used Buffalo Trace and simple syrup and I found that the spices dominated the cocktail completely. Now I have started using a more potent bourbon in Makers Mark and a muscovado syrup. It takes the cocktail to a very different place, but I find that it benefits from the dark molasses notes. Quite tasty.