Thanks for sharing this. I don't have a ton of spare time at the moment, but I will experiment with it too and see if I can eliminate it completely. I know changing fuel helped a lot, but this is certainly worth a try.
I made a comment on the Civic X forums about this. I previously owned a blue FK7 Civic EX.
I got the P04F0 and the rev matching codes at around 530 miles, shortly after installing my Takeda intake. I brought it up to document the fact that this happened shortly after the intake install.
Since...