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@Oswald
http://velonews.competitor.com/2011/12/bikes-and-tech/ask-nick/ask-nick-proof-that-running-an-11-32-on-ultegra-di2-is-possible_199407
Have a look at this .. Wayne Stetina is Shimano USA .. Worst case I would have thought simply changing the B screw to a longer one and the top pulley to a 10 tooth would give clearance for 32t based on this.