The adition of a rogue level wouldn't be too bad, although it means you don't get that nice 6th attack at 20th level unless you go Monk 13 / rogue 1 / Fighter 6 or find some good monk PrCs that grant +1 BAB per level.
Three levels might be overkill though. The extra d6 of damage probably isn't worth the loss of 2 more points of SR, Quivering Palm, Ki Strike (adamantium), etc. Even if you don't go the fighter route so you can still get those abilities, you put them off for three levels, and only gain an extra couple d6 damage and trap abilities. The evasion is one major reason to multi-dip into rogue, but you've already got that.
Earth's embrace: IIRC this has been reprinted in Complete Warrior, and rather than dealing double damage you now deal an extra d12 damage. Its still quite nice, but nowhere near as over the top as it used to be.