Are you using a quicklink? If so make sure it is properly set. Otherwise you may also just have stiff link somewhere in the chain.

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Stiff link in the chain?
Front derailer not allowing chain to fully drop onto small chainring?
Stuffed or incorrectly installed bottom bracket?
Ive had that one before where a stuffed drive side BB bearing allowed the crank to rock and I would constantly drop the chain off the inside of the small chainring when changing down.
Took me a while to find that one!

So, this is very odd. I now have the shifting down. Shifting is good, other than the front chainring hiccup. It goes smoothly from one gear to the next, other than the hiccup. I am using a KMC 11 speed chain with missing link. Missing link is locked. I will check with a tight link.

Links are all fine. I just checked. Not stiff.

A picture or short video of the problem would really help.

Does it happen equally with the chain on the big ring and small ring ?

check for bent or cracked tooth on the chain ring.

Yes, they both slip. I'm pretty much convinced that it is the derailleur hanger throwing things out of whack. It was difficult to screw the rear der all the way in. I think b/c it is throwing the rear mech out of whack, the slip causes the cage to drop which pulls back on the chain and results in the chainring teeth not fitting neatly into the chain. Everything is brand new on the drivetrain so I doubt it is damage and I know it can't be wear. I have a new hanger on the way from Canada, so I probably won't resolve it until next week. The only other thing it could be is an improperly installed cassette, but I don't think I overlooked anything and it really isn't cog specific.

Let me know if you have any other thoughts though.

Wrong speed chain?