Chris, I like your switch to the 12-13 on the 11-32 cassette. This may be enough of an improvement to satisfy my search for perfect cassette. I have a new 12-27 laying around to I should be able to try this tomorrow.
I also have the Campy/SRAM setup and it does work perfectly (on the road) with the Shimano cassette. It's bafflng that the SRAM cassette wasn't even close to working.