The system here suggested my Hamilton 151 (eye roll) for the float, and it obliterated the egg foam. The drink wasn't bad with it, and I was pleased it wasn't all that sweet. Maybe something to revisit to test different rum combos.
Being a big rum drinker was looking forward to this, but found it just OK. Nice but was a bit underwhelmed with this cocktail. Agreed with Andre that it needed more aged rum. Seemed to work a bit better mixing in the overproof rum to add some depth of flavour to the cocktail. Did drink the full cocktail, but there are other rum cocktails much better.