I am 6 foot 1 inch, (185.42 cm) and initially purchased a 60 cm Paramount in 1986. Was probably a tad too big for me. About 20 years ago, I bought a Cinelli Super Corsa frame, in 58 CM. That fits me much better.

You, at 191 cm, are about 6 foot 3 inches, so I'm thinking the 60 might be better for you. This would also help with any toe overlap.

Spending this kind of money on a frame, I might take the advice to get a professional fit. It might be worth it.

EDIT: Oh...and with threaded steerers, "stack height" means something different to us. 58 cm below: