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Yup - first thing to ALWAYS do with any Cannondale - ditch that piece of shit SI expander!!
Bit late to this party as most of your questions have already been answered but I ran a caad10 disc black inc for about 6 months in a number of guises:
Ran 30mm’s on wide rims which came up more like 34 with no issue at all - great fun actually!
Found cable pull discs (Shimano CX77) and Ultegra, which was my first build iteration, miles better from a maintainability perspective than the SRAM Force Hrd I had on as a second iteration.
Seeing your build makes me miss mine!
Just fitted a standard FSA expander/top cap, much, much better than the terrible Cannondale SI one that snapped. Now I know why my headset was always loose.