Dev, thanks for the info, wow, bummer, I thought the custom Delicious tune was it for you. I've had basically the identical issues with my '13 since I installed it. Mine isn't even consistent, sometimes it acts fine, other times it's a complete PITA. Recently I was on a trip for a couple weeks and when I got back and ran the car again the idle was so bad it was stalling and not starting and almost stranded me. The next week I started it up, having done absolutely nothing, and it now runs 100% again. WTF. One doubt I still have is if that strange cam angle sensor issue the early cars had, might still effect cars outside the VIN range (mine is outside of it, barely) but just in a less obvious way. I think it's the randomness of the issue that makes it so hard to troubleshoot. You can't tell when you make a change if that actually had an effect. Look how many times both you and I have been fooled.
I still question the cam angle sensor/tolerance because the only thing that ever helped my issue was when Edelbrock played with the CARB tune for me and moved my cam timing back to stock, then I was at least able to drive the car, albeit with the hesitation issue still being there but not as bad. The difference was pretty huge, so that seems like a flag that the cams/related components are possibly involved. At this point I've pretty much given up and don't think anyone will ever figure it out.
Does anyone know if it's possible to log the cam angle sensor outputs? If so, i'd consider logging and seeing if they get erratic when the car is acting up.