I may not be an Asian guy, but as an Asian female who has dated Asian and non Asian men before becoming an SP, I thought I would share my personal observations regarding the differences between the ways non Asian men and Asian men approach women. I hope you don't mind.
I haven't dated too many Asian men because I find that whenever I know they are interested in dating me, they never come out and say it. At least with the Asian guys I tend to meet, I find that they like to spend a LONG time keeping things platonic in hopes that one day after playing the "Mr. Nice Guy" game for 6 months, we'll be sitting across from each other at a café, lock eyes, and I'll realize that I'm madly in love with him and the friendship will just magically become a romance. On the other hand, whenever a non Asian guy is interested in me, he tends to be more direct in his approach. He'll chat me up for a bit before asking if I would be interested in grabbing a coffee or having lunch with him at another time. Non Asians are less likely to play games which land them in the "friend zone" so to speak, which I prefer.
I'm not saying that this is how you specifically are going about approaching Asian girls, and I very well could be biased, unaware that this is some cultural thing that they do in Asia, but this has been the complaint of a few other Asian females I know who grew up here as I did. Maybe this is a factor in why Asian girls in Ottawa prefer white guys over Asians?
Best of luck, and hopefully you find that nice Asian girl soon