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For the record, I also experienced this flat spot, it was more 3.5k-4k rpm. I changed the cam shaft angle sensor, and the intake VANOS solenoid valve (although both had logged codes at that point. but previously they didn't log any codes but i still felt the issue)
and now it revs much more freely. I also have the BMS powerbox "tune", and that made it worse when it was having VANOS issues. but now its better.
Talked to my mechanic and he said vanos solenoids are common issues, because over time the oil gunks them up (also the space between oil changes).
I'd suggest giving that a go, there's some guides of people taking it out and cleaning it themselves, but just get new ones.
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