At the risk of offending purists, as a tall stack needing person, this is how I am running my Supersix - Kalloy Uno 17 degree stem flipped up. It's a frameset with a 55cm ETT, like my Bingham, but with 551mm of stack instead of the 603mm of the Bingham. But the contact points are the same.
Even if you go custom (or production) this is a very low cost experiment to ensure your next bike is what really works for you. There's no other realistic way I could ride a Supersix...which I really enjoy doing
