I replaced my bars with renthal - which reduce vibration over the stock bars (without bar ends).
Then added KTM handguards.
I then had the original barends machined to fit the KTM handguards - fitting these results in almost zero vibration.

I recently rode 3 Teneres back-to-back
1) Renthal 916 (Dakar High Rise) + KTM handguards + end weights
2) Standard bars + Yamaha handguards
3) Renthal 966 (I think) + KTM Handguards

1 was the smoothest
2 and 3 felt about the same.

Russ