if you determined it's not a problem w/ audio drivers, cable connections, source files... then I would give it 2 weeks for you to get used to the new sound (slash burn-in, i don't believe in burn-in though). sometimes, when your brain is customized to a certain sound, switching to something new makes you feel like you're losing something. After 2 weeks, if you still don't like em, just return em b/c that's really how they sound. Fiddling w/ amps/dacs will only change the sound at most 25%, but there is no use trying to get a pair of headphones to sound like something it naturally isn't.
For "intimate," I am not sure exactly what you mean. If you mean things just sound closer, it might be that your new headphones has a larger sound stage, so things that are farther away sound farther away. Or it could be the bass is warmer on one pair vs the other. Hard to say as I also never heard the pair of headphones you have.
good luck & i hope you find what you are looking for