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Brommers-
The FD was adjusted correctly
That's what they all say :P
Cage wasn't bent or was something flexing that would allow the chain drop even though it appeared limited correctly in a workstand? Seems an odd one to happen in both directions. What sort of frame? Not old steel or cheap carbon? You weren't running some super RD cage that had really slack springs like a CeramicSpeed hanger?
hippy
What sort of problems?
Shimano made stiffer rings to deal with DI2. I've used Praxis for a shitload of miles though and they mostly work fine. I a weird chainsuck incident in one of the TransAms but that was resolved with a punch and I I might've not had a Praxis outer on at that stage but a 46T from some other manufacturer.