Took me a while to reply (always Gateway timed out)... ok, time to reply.
XP3 has a V shape band so the bass and high sounded high, tune down the volume should help a bit, otherwise you'll just need to tune the EQ with less treble.
XP2 is rather flat (balance) so the high won't be so sharp.
I, myself also got slightly irritated by the extreme high but I guess I got used to my AT-CK300M which has very flat treble responds, but the clarity and detail really good on the XP3, should be the reason of the high that pushes some of the detail that you usually won't notice.
I'll try to audition the XP2 again to compare it with my XP3 after 150 hour burn-in.

So I guess that XP3's high still will stay high even after long hours of burn in?

getting dizzy listening david guetta on xp1, the bass is bombarding me like an ac-130, death from above~

mainstream song has massive bass that would blow up your mind !!
if you are not that kind of person tat like massive bass~

You can try with 200 hours burn in and try it but my ear just itch to try out after several hours lol, but after 80+ hours the audio isn't so significant already so if it's still too high to you then I'm not sure what way to reduce it (burn in).
Anyway there're few AMP out there that you can try out to reduce the high, some did that (need to audition) if I remember correctly it's a small white box, from Hippo ... well you can use that as pass-through to reduce the high.

White hippo box? Hippo box+, hippo cricri? Btw, still burning in, hope the highs won't stay that way..like the Beyer DT231, at first the high are very high, but after using it for a year, it getting more neutral.

Let it settle down for a longer time. Beyer products tends to have longer burn in time.

Ok, will use it more often and see if there's improvement.

White hippo box? Hippo box+, hippo cricri? Btw, still burning in, hope the highs won't stay that way..like the Beyer DT231, at first the high are very high, but after using it for a year, it getting more neutral.

Yeap~ That's the spirit, patient... well, I'm currently queueing more songs (vocal) for extended burn-in.
Searching for more classic 24-96... *ahem*

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Added on September 19, 2012, 7:04 am
http://jaben.com.my/shopping2/Hippo-Pipe-Mini-Amplifier/
It's Hippo Pipe Mini, found the image at Jaben Malaysia, the demo unit at SCLG is way too plain, just know it's a white stuff, you can try to audition it and see if it can helps you, or take boss walabies advice, he's experienced afterall 

try with different tips, the tips can actually tame the high slightly down by going for better seal and deeper insertion.

Personally i'm using third party tips now instead of the stock beyery xp.

Which 3rd party tip u r using? I'm still looking for the perfect silicon tip. For now I settle for tips that come with my Adagio II.

Was just wondering, I was bundled with a pair of foam tips by Hippo, when i purchased by XP2, hence i'm curious about the performance of Comply foam tips.

Anyone with experience with these 2 and is it worth it to fork out the cash for the Comply foam tips, or just stick to these hippos? 

Not too sure on that, a free tips i get from Jaben, it fits better in my ear and better seal, and i can get much warmer sound.
Tried both, although the material seem different, but both same feel in my ears, sounding wise i couldnt differentiate much. However Hippo Foam is so much cheaper compare with comply, so i stick with hippos =P.

who sell this earphone? i want it reply asap