Please do read the first page for more info, 70+ hours for starter, 150+ hours for best performance.
Mine feels much better after 300+ hours. Mostly just listen to it when it pass 150+ hours, sibilance should lax at this point onward.

Almost every dynamic driver IEM/headphone needs burn-in, some has significant some has little to no improvement and will depends on each person's ear.
If you get used to those monitor headphone, yes, those 0-hour driver will sound very muddy and has no whatsoever quality except they delivers audio.
My XP3 has 300-hour before I actually appreciate the peak quality though now rarely use it due to my EPH-100 (can't let go ), will gets some foam some other times (not planned) to really wear it comfortably at my ear.

Maybe your source's volume is too low, try to adjust that instead, laptop's amp should be sufficient to drive any IEM (multi-drivers BA aside).

Claim from where you bought it, different company has different source of supply.
Or you may try Jaben as they're official supplier for this product.