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Was traction control on or off (long press)?
It's looking like it was on, or in dynamic mode.
I can see what you're talking about and what I think is weird is everything backs off, vanos, timing, fuel pressure, throttle. Boost keeps going up as does load, and load does overshoot target (which IIRC will cause throttle closures), but the rest is strange to me.
The only thing I can come up with, and mind you I don't know the N55 at all, is maybe the MAF is dirty.
The log acts like it's hitting a limit of some sort. But looking over what I think is the tune you're running, I don't see anything that would be a limit you're near. So I'm going with it's not something in the tune.
Sparkplugs could be. I'm sure they'll help. I don't think they are the cause though. It really seems ahead of them in the chain; air, fuel, spark, exhaust.
Pull the MAF and look at it. If it looks dirty, clean it. I really think that's what it is.
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