“Vermouth coated ice.” Pish, tosh. Either buy good vermouth and make the drink like a sensible human in the proportions given, or just admit that you hate vermouth for some unexplained reason.
Seriously, how can you dislike vermouth but admit bitters?
(The 15:5 comment is simply nonsensical)
I served a variation of this before Thanksgiving dinner today. I used a mixture of bourbon and applejack, but in roughly the same proportions. I made the drink in advance and put cinnamon sticks in place of the cinnamon syrup. Guests really enjoyed it, as did I.
With so little lime juice, I would not think this sour enough to need an egg white.
But I did add a splash of pimento dram to add to the mysterious funkiness of the pisco.