apologize for the huge bandwidth photos.
I measured center to center. 85mm. If I had to guess, I'd agree with 7º.
I also have the OEM C4 which is 95mm at 6º, according to Cannondale info.
the seat surface is 5.75" taller than the top of the handlebar stem.
The only BF I've found, so far, uses some "high end" device for $300. Don't think the bike is worth that much.
Gotta try one other smaller store. M&Ps have closed around here or been "chained" or snootified.