I agree about the Bokers Marc, I usually err on the side of MOAR with Bitters anyway.
Tonight A Staggering Old Fashioned
3 oz George T. Stagg Bourbon
¼ oz sugar syrup
3 dashes The Bitter Truth Jerry Thomas’ Own Decanter bitters
1 dash Fee Brothers Whiskey-Barrel Aged bitters
1 dash Angostura Orange bitters
Add bitters and sugar syrup to an Old Fashioned glass and stir. Add the Bourbon and one giant ice cube, stir well for a minute or two. Twist a slice of orange zest on the drink and drop in to the glass.
Well, that will certainly get your attention.