Ok, I was not expecting how much all of these changes make a difference. Sony really tweaked these, not to mention there was some changes measured after use as well.
Brief comments:
1) My first measurement was brand new and it matched the harman curve pretty damn well.
2) After some use, not a ton of hours, but 6-7khz came up. I am not sure if something changed with my measuring technique or if this was real break-in captured. My other MH755 did the same thing.
3) As Slater mentioned, the black mesh screen really makes a huge difference. I would not remove it, way too peaky. I would love to get this mesh for some other earphones.Micropore has a similar effect, but damn Sony's material is clearly a winner. magical almost.
4)The foam plug helps widen the lower treble boost extending it across more frequencies.