The WOT log you posted , the max RPM you hit was 6706 your RPM scales end at 6592, I'd leave it as is.
what happens is we only have 17 data points to control the RPMs , so if we make the last point 7000 and leave the 2nd to last at 6144 , that's an 800+ RPM difference between cells, too far between data points timing will wander between Spark tables.
I'm going to post another tune for later on today,
the original tune was a good aggressive tune, decently thought out, and well written. and very close to what I would have done for a customer who wants to Race more than Drive.