Weird noise towards redline. RPM's drop and go back up near redline. datalog attached

[pwnall1337]

The car is a 2015 fiesta with gtx2860r. During wot towards redline you can see the rpm drop and then go back up. I've noticed this a week ago, but didn't realize what the strange noise near redline was until I data logged it today. AFR spike concerns me as well.

redline.csv link below.

https://drive.google.com/file/d/0BwbTApk8RdKTZHgxOGdBWDJxMHM/view?usp=sharing

Any advice/help is appreciated.

Thanks