Enjoyed reading that, nice post!
Yeah I couldn't live without a little EQ on some hp's. Its ideal for personalizing. Our hearing is different person to person, so being able to pinpoint the freqs that cause annoyance and amending these for taste can be a godsend. Especially if you really like a headphone apart from maybe one aspect of its treble for instance - where no change of amp will help.
If I could recommend the Latest foobar 31 bar equalizer. Its very good.