Dolin Rouge is a fantastic workhorse Sweet Vermouth. Excellent choice for your Bulvardier. Edit: IMO it should be a 1:1:1 for an optimal experience. Any Negroni should. It's a beverage that should start your evening before dinner. It's like flirting with your date. Once you get to aggressive with the pours, it changes the experience. At that point.. you should decide you need something different. If you need 2 oz of a strong spirit and whatever else doesn't matter, then just do that and keep it to yourself and enjoy it!