New Star and 9VIP had two two nice rump ladies, respectively, Tina and Cherry (who also worked at EPM). Good times with them, but I'm not sure where they are. The next would be Lisa/Tika in south philly, both have latin bodies (a bit more typical for southeast asian women); thus far they have the absolute fattest asses of any asian women in philly in this scene. There's also Monica from Cuties; her ass was indeed pretty big for a chinese woman; unfortunately she has disappeared without a trace.
You also have Anna from 465 Spa in South Jersey. Her ass is most definitely been surgically modified, but it looks amazing and indeed is bigger and more shapely than the avg asian provider.
That's all I know. I'm still on the prowl myself.