hello!
I donīt know exactly where in Asia you are located, but have you try to readjust your own office hours, in order to be able to speak to them in US?

For example: A friend of mine, used to work for a korean company, due to the 14 hours difference, whenever she wants to contact them she stated 3 or 4 hours more from her regular shift (instead of leaving at 5 , she was leaving at 9).

Just a thought!
xoxo
GMpassJC