There is an old thread on Rachmaninov's 3rd where you also have posted but that was 2013...commenting that you did not like Argerich's interpretation.
I guess you can play it yourself and follow the score closely.
I discovered this recording :
http://www.head-fi.org/t/47019/rachmaninoffs-3rd-piano-concerto/30#post_11476739
I am not a musician and can't judge if she is not following the score exactely. A few "liberties" are mentioned in the booklet.
I am not bothered by that, I simply indulge in this recording expecially with the HD800.
Btw where do you have all your Focals set up? Do you have a former factory space for your rig?
And of course : Congrats to your new HD800