As I had previously posted about my new Macchaito build and the problems associated with the front derailleur on the DI2 be being so powerful causing the Praxis chain rings to flex and deflecting The chain off outward bound , i'm sure your TA rings were not built for DI2 and you're having similar problems, the DI2 FD slams the chain up to the big ring so fast that your rings have to be flexing and throwing it right off, without giving it any chance of settling in. FSA Super Type Chain Rings N10-11 are built to handle DI2 shifting. I don't know in your case if 50/34 compact is too large up front with whatever cassette is in use.but a 34 up front & 34 in the rear gives you 26.3 gear inches plus get rid of all your mix & match on chain rings that are out dated for DI2 usage.