I made it 2:1 as I saw it on a Rogue Cocktails spreadsheet. I like it but I would also drink just vermouth or just fernet, so I was pretty sure it was gonna work.
This was great! I made this with Lustau Palo Cortado Peninsula, Amaro Meletti, (unaged) Genever from Wigle in Pittsburgh, Ancho Reyes and Angostura Cacao bitters. Unusual build that I want to explore more.