But don't ever ask me to measure your own set, will not happen!

Is that because you don't want others to have your calibration and or be able to simply duplicate your method ?
Don't want it to benefit the DIY community ?
Scared Neumann copies the rig ?

Marv and Hans can easily 'apply' that calibration now but think they won't.
I have tried various methods myself and found that some headphones closely measure the same (except with the mic in ear method) while others measure quite different on different setups indeed.

Especially the 1kHz to 7kHz often is affected and can differ a very audible 5dB or even more.

My reference is one I personally trust (others won't perhaps) as listening to that to 'well made recordings' results in real sound with no hint of 'gear'.
My HD650 measures quite similar to yours (and GE's) but not to the ones on some other sites (who differ slightly here and there)
I believe Marv may have shown why that may be, as there seems to be some product variance.
I suspect Senn applies the same kind of 'matching' procedure for HD650 as they do for HD800 resulting in somewhat different sounding HD650's but with decent LR matching.
Perhaps most manufacturers of expensive cans do.
Fostex surely doesn't for their 'cheap' T40-T50RP line .
I have measured and modded quite a few of those and ALL of them had substantial differences between L and R drivers, sometimes I combined/swapped drivers from different HP's to match them closer before modding.

Saying who's rig is 'righter' and can be trusted more or completely is a bit ... well...

But you are right... you should stick with what you feel/think is accurate to use as a reference and have to draw a line where to 'work' from.
A 10dB difference, however, between your and CS measurements (differences between Hans's and Marv's are smaller) is substantial though.
Did you sent your samples to them to compare your rig to theirs, knowing they would be measured using different methods ?
If that is so then dismissing their (somewhat similar) measurements and claiming yours are 'more correct in an absolute sense, which may or may not be true, is what rubs people the wrong way as most trust CS measurements.

All measurements do show a nice linear behaviour (which is good IMO) but all appear to show a different sonic character ranging from extremely 'flat' (in my book) to flat-out warm (in my book).


I know my rig isn't perfect because to get accurate mods/EQ for a few headphones I have to listen/compare to my EQ'ed reference.
I will be open about it and tell you (and every reader) how I 'calibrated' my rig.

I 'calibrated' my rig (a flat line = sound without 'colour') by combining all known plots of HD650 (even used Tylls raw plots but with different compensation) and compared it to my own 'raw' measurements (no ear-canal or Pinna). I also know how my WM61A reacts and after I compensated for that, I only needed to 'compensate' the lows which, in hindsight, appears to follow some rules I wasn't aware off.

When I EQ my HD650 flat on that one it sounds 'right', yet when I do the same to a T50RP it doesn't sound equally 'right' and have to lower some upper mids.
Similar to how your PM2mods sound 'right' to your ears.
You have earned my respect for getting a somewhat wobbly FR 'flat' by 'mechanica/acoustical' means only !

So I know my rig does appear to measure some headphones 'correctly' but other headphones may not.
I get very similar measurements as yours though, so understand your level of confidence.
BUT as UB already mentioned:

As far as which one is superior, for me it is very hard to say. I would not say mine is superior to anyone's FWIW because that I honestly do not know.

Also, the mods seem pricey... But I know I'm a cheap bastard and might say 99% of all things hi-fi audio are pricey anyway so who cares.

I can't/won't say who is 'righter' though, in an absolute measurement correctness kind of way that is.

Hint: perhaps stick (and post) to your 'knowledge' with some humbleness applied and take the rest as 'jokes'.