I am very, very certain the measurements will lineup with a mid bass dip around 40-100hz. It's clearly audible, as is the brightness. I'd say overall, they're better than the APP2 - but I can definitely imagine a lot of people preferring the APP2 over the 3.
I posted a video from Dave2d a few days back where he did a frequency sweep and it shows exactly what you describe (cut around 100hz with a couple extra db down low, boosted treble), and his comments mirror yours.
Of course what an ear hears will be quite different from what a basic coupler shows due to all the DSP shaping that it done, but it should give a good rundown of the relative baseline differences.
It's a bit of a shame, as recent IEM research (Meta tuning) seems to suggest it's moving away from what is beginning to look like a more natural tuning philosophy, to something that's more v-shape, Harman'esque, target.
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