I find the proportions to be a little off, at least for modern tastes...I increased the proportion of everything relative to the egg white (so 2 oz of rye whiskey) and increased the ratio of whiskey:Pierre Ferrand Orange Curacao to 2.5:1, and cut the absinthe to 1-2 dashes...that seemed to balance it out more.
I love these ingredients, both separately and together, but I found the whiskey aspect to be a little overwhelmed by the vermouth (and that was using BiB rye exclusively, instead of bourbon). I increased the total whiskey to 2.25 oz and that seemed to balance it out more.