Kong music's stuff is seriously good. Nice unison with the dizi and erhu. The melody is very mainland Chinese. Strange thing about my melody is it's more Taiwanese, since my melody has more Japanese influences.
Apart from legato and all the bow related articulations, there is an overall stylistic guide you can use for how to bend the notes. It all roots in the language and the intonations, but since that'll require too much time to learn, you can check out the chinese opera tunes. Not the Erhu, but the soprano relative, Jing-hu was used to accompany the lead vocals in traditional chinese opera (Beijing Opera, or Jing-Ju) , and it seems to me that the bend styles have evolved from there. (based on vocal style)
http://www.chinapage.com/xwang/index0.html
The vocal style also carried over to pre war swing/big band era (during japanese occupation), when shanghai was at its highest. Those are definitely worth a listen since they retain the bend characteristics, but also exaggerates them so it blends better with the western based accompaniments. I can't find any at the moment.. I wonder if they can even exist on the internet.. I'll let you know if I find any.
The movie Farewell My Concubine captures the final days of Beijing Opera, with a mix of how the Japanese takeover happened, and it s cultural consequences. But best of all, it takes you into the life of a lead prima in a Beijing Opera company.
http://www.imdb.com/title/tt0106332/
Actually, most interestingly, there is nothing foreign about the piece you wrote. It's peculiarly native, and that's an amazing feat. Great work!