Just a thought--before you give up on your Kukri, try making a few changes to your gripping technique. There's an art to using a kukri correctly that really affects how it feels.
If you're feeling vibration, it's because you're holding onto the handle too tightly. Grip with the pointer finger and the thumb, and let the rest of your grip be fairly loose. This will allow the blade to swing into the wood, and you'll get a more powerful chop, and it also will reduce the stress on your hands. You'll find that with a lot of those more "ergonomic" kraton handles, that those will actually tear your hands up a lot more than the wood or horn handles on a good kukri.
I'd recommend reading through the safety thread in the Himalyan Imports subforum. As long as you already have a good chopper, you should be able to use it without pain if you alter your chopping technique.