Actually, I was quite surprised about how the clamp works positively... It feels like LCD-2 are a large window around you that enables you to enter the studio where the performance of music is being done. I do find myself more into the music than with lightweight and non-intensive headphones in terms of their cooperation with my head. But this is purely subjective...
I do not have these options you mention... And so I learnt how to distinguish the sound, gained some experience experimenting with my two previous phones, sine waves, equalizers, tons of other plugins... It's enough if you have no other option.
I trust measurements way more than my ears, to be honest... This is because I do very precisely know which kind of sound I seek for. I do know that technical perfection is not always the best thing and that's why I am not interested in HD800 - they are going to be too detailed and analytic for my approach. Also, their bass is not enough to reproduce real impact of lovely played bass guitar. The treble is not tragic, no, but it's too much in the region where I hate it (5 - 9 khz). Overtreble is for sure ruining the whole experience for me, way more than not completely flat mids or bass.
HD800 must be perfect for classical but I do find LCD-2 rev2 much better for pop, rock, metal and acoustic-guitar based music for sure. They are simply stunning... I am not able to describe it, it's just a real experience. Live performances sounds even better than when you visit the gig yourself... No matter if it's symphonic concert or rock.
Again, I strongly suggest to pair LCD-2 with TB Isone... You will get the improved spatial interpretation (soundstage, a bit better imaging).