I think I was wrong. After a month of riding the other chain, I swapped back to my Wipperman 108. Noise increase is pretty minimal. I think was running the chain too slack so it was tapping on my chainring. I have it a little tighter (2-2.5cm P-P to ~1cm P-P) than usual now and things are much quieter.

Running for 6month and still hasn't stretched much. With noise manageable, I am gonna buy Wipperman again. But I should try HKK also ... I am supposed to support the local industry of my own country, you see?