Shenzhen is 14 hours ahead of Houston
There is no standard 8-to-6 overlap. Someone joins early or late.
A 14-hour difference puts Houston and Shenzhen out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Houston takes the early call, the next week Shenzhen does. These times hold for most of the year, but Houston's daylight saving (which Shenzhen doesn't use) shifts them by an hour twice annually.