No headphone is completely accurate. However, I was speaking about the bass on the LCD3 vs HD800 and 009. When doing music production it is as close to reference as you can get and this is confirmed when I move my work to speakers. Like I've mentioned before, it is not only my opinion but the opinion of many people in the EDM industry, some I consider my friends. It has the perfect decay and impact for judgement when producing.
It may have been the fault of the amplifier but I've been PMing head-fiers that own the 009s and BHSEs, T2s,etc, and they come to the same conclusion as me. It is the character of the 009 and nothing will change that. The 007mkI has more quantity in its bass but it also depends on the seal that you get with the ear pads. This is why the Audeze cans have superior bass, the seal is critical to it. If the 009 did not have the $5k price tag, many people would not be defending it and would acknowledge that the little brother, 007mkI, is just technically better.
On the topic of frequency response graphs:
I like reading data from frequency graphs as much as the next person (and I am an engineer by profession as you are MH, data is our livelihood) but my ears sometimes tell me a different story. I still think that the measurements are inaccurate to what we hear because of factors such as ear pad, seal, internal reflections, etc.