Have you undone the VAFC? You mentioned it, but never said you did. You need to be able to cancel out all other variablse as to why it's not working. It would seem to me that the controller is trying to override the P13 since it redlined at 6500rpm.

Also on that note, it's bad enough that you're using the P14, but are you sure that it's an H22a4? The a4 is an OBD-II motor...or do you have a converter?