Note also that Campagnolo/Tifosi BBs are ISO taper. Shimano and basically all others are JIS. They are not interchangeable. So a 111 mm JIS (Shimano) BB will put those cranks in a different position when compared to a 111 mm ISO (Campagnolo) BB.
Also just double checking - are you using carbon-specific brake pads? If you need to buy some I can recommend Swisstop yellow pads.
As far as I'm aware the tapers are interchangeable as long as you adjust for the difference in effective spindle length. I think Sheeldon's point was that they still hold the cranks just fine but in a different position (i.e. further outboard/inboard).
That is a cracking looking bike! It is going to fly I'm sure.
BB length should apparently be 111mm for Centaur double.
https://thecycleclinic.co.uk/products/campagnolo-centuar-bottom-bracket
Note also that Campagnolo/Tifosi BBs are ISO taper. Shimano and basically all others are JIS. They are not interchangeable. So a 111 mm JIS (Shimano) BB will put those cranks in a different position when compared to a 111 mm ISO (Campagnolo) BB.
Also just double checking - are you using carbon-specific brake pads? If you need to buy some I can recommend Swisstop yellow pads.