I'll say it again, I've got 6,000 km on a Rotor 3D+ crank in a BSA shell with Di2- bit of grease, works fine.
The crank arm does not rub on the di2 cables? Mine did.
From reading the thread isn't the ID of your BB shell larger in the middle? I'm certainly going to give fitting it a go when it arrives, but not awfully hopeful.
Have you sheathed the crank axle with anything?
@Dammit started
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I'll say it again, I've got 6,000 km on a Rotor 3D+ crank in a BSA shell with Di2- bit of grease, works fine.