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Looks like you're running very rich (goes down to 10.5-10.8 at redline).
Doesn't happen in 2nd gear at the same load x rpm (you get 11.5 afr), may actually be triggering the cat protection mode (which is normally disabled by most tunes these days).
The dme has the exhaust temps calculated by a mathematical model, and as you spend more time at WOT, you can build up the temp in the calculation and cause it to go into cat protect mode, which defaults to a low afr (a sliding scale which bottoms out around 10.4 AFR). Results in not much power at track days where its trying to save your non existent cats while you're spending a lot of time at WOT.
Since it didn't happen in 2nd gear and is more prevalent in higher gears towards the upper rpm range, looks like it might be happening in your tune.
The relevant table in the xdf that governs this is "EGT NOx Set Point (CAT Protection Mode)"
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