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So, the issue appeared on both BBs? They were the same size rings but did you change the height of the FD at any time? What size gap did it have over the big ring teeth?
Given it works with mechanical fine, is there actually a measurable difference between cable and Di2 FD cages? If they are the same dimensions then it must've been something specific to the first install. If the FD dimensions are different then maybe there's a reason in that.
Did you have the little offset middle bolt adjusted properly? I know this is sucking eggs theory but the Di2 limit screws work a bit differently to cable limits stops.
I want to take my 10spd cable back to Oz where I don't need to change gears. The cables will last forever and I'll no longer need to buy 10spd parts.
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hippy
Yep
The two Di2 bikes had different BBs - Rotor BSA30 on one, FSA on the other. The rings have behaved perfectly since I fitted them to the Cannondale with the mechanical DA9000 groupset - never a problem.
There's a fighting chance I was pissed as a fart every time I installed them, but even drunk as a newt I wouldn't fit them the wrong way round - the recesses for the chainring bolt holes would be on the wrong side of the chainring.
That's my conclusion - I'm just cursed. From now on, no Brommers+Praxis+Di2 combinations.
You're too kind, but happily I still have enough bikes with mechanical shifters that I can find a home for them.