Hmmm, this doesn't reflect my own experience. Etymotics have a similar measured bump at around 3Khz, and reducing it (by about 5dB) makes for an audibly flat sine-sweep while also massively, and I mean massively, improving the audio. Whatever the compensated charts say, which remove the bump, I can clearly hear it.
This also seems to contradict the previous findings, that listeners prefer that bump removed.
Is there a problem here, or am I missing something?