Joe's email is: questions@daviswheelworks.com
I question the 28T chainring with 52T. I'm not sure if a Campy derailleur is happy with that big of a jump. Joe did something on Amy's bike to give her low, low gears. He and I had a discussion on these same lines a few weeks ago but I don't remember the details.
While a trip to CA is always nice, I'm sure he can advise and then supply parts. I know that SRAM or TA was in the discussion.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.