I haven't read the next posts, yet. But, I come from a similar path. I bought mine, blind-so to speak-as well, and my first set of what I'd call good HPs, was the SR325i. At first, I found them dark and small, and wondered 'what have I done', at least for a couple of days. Either I got used to the sound, or they loosened up a bit, because now, I'd not part with them.
I also started upgrading the cable with a Wywires Red, which opened up the treble quite a bit, for me. I now use a SilverBlue Audio cable from SilverBlue audio of California...my final cable purchase for this HP.
I gave my Grados to my son, and bought the PS1KEs as an alternative to my Xs. I use my Xs for serious listening, and the Grados for diversion, once in a while.
In short: It might take a little brain burn-in, or HP burn-in, but you might just find that you've fallen in love with them before too long. Welcome to the X-family.