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I recently built up a BMC TM01 with Ultegra Di2, Quarq BB30 Elsa, and Praxis rings. Shifting has been great with one frustrating exception for which I need wrench advice:
When I'm in the small chainring, and the 5th or 6th cog, and I attempt to shift to the large chainring, the chain intermittently jumps off, inboard towards the bottom bracket. It doesn't happen every time; maybe 1 in 20 shifts. I have not had this happen in the other cogs.
I've checked the limit screws, cage height and cage alignment. They all look good, but I must be missing something. Video and photos below. Any suggestions would be greatly appreciated.
YouTube VIDEO: http://youtu.be/ALhIlgvIpBU
Photos:

