I have experienced similar problems to you guys - mainly a very rough regen cycle and lots of hiccups.
More significant though, is the big fuel economy hit I've taken - especially at temps below 40F. I've seen an average mileage drop of around 5-10% for the year, with as much as 20% drop below 40F. Where I used to get 48/49 mpg straight highway in the summer, I get 45 now. Where I used to get 48/49 mpg straight highway in the winter, I
can not break 40.
I've taken the car to the dealer twice and asked them to check everything over, they said they looked and everything was good. I looked myself, and couldn't find anything obvious amiss. But I didn't remove my front clip or even know what to look for really (probably the same for the techs that "checked it over.")
Also, I asked "could the software not have been updated when the kit was installed - can you check that the software is updated?" And they said the software is up to date, and that the kit didn't require a software update anyhow. Is that true?