I used an infinity rum I made instead of the aged rum here, and this drink is a good one to use it in. My infinity rum has a mix of white, gold, aged, pot-still, and overproof rums, and it's around 45% ABV.

I also added some Abbott's bitters because I think they work well with amaretto. I think I'll give the more rum and less pineapple idea folks have suggested next time.