I would not hesitate to grind enough to eliminate the sharp-edged stress-risers and smooth and contour the backside of a Campy crank...but that SR Apex does NOT look like the model to follow to me. I can't follow what SR was trying for in milling out that much material right there (maybe for chainring clearance with their BCD), plus there are still sharp edges, just not in the same place as on a Campy NR.