Amaro: The world of bitters!

Thanks to everyone who's been offering their thoughts on my ongoing cola-amaro project. Here's the latest attempt, which involves an Open-Source-Amaro-type base and a homemade cola syrup with some very interesting botanicals.

Amaro base (steep all ingredients in 55-60% abv grain alcohol for 7 days)

3g gentian

3g dried bitter orange peel

3g cinchona

2g birch bark

2g chicory

1g sage (fresh)

.75g rosemary

.25g star anise