Xu clashes Chen: having the tombs open (or the contents inside being available) is correct, but it's not really the major cause of auspiciousness. But that's for a deeper discussion, which I'm not ready to write now.
Back to the birth time:
Honestly I do not know ZWDS, but I definitely think that the hours should be the same in ZWDS and Bazi, because both are birth chart systems. I don't agree with those who say that Bazi uses solar time, while ZWDS uses clock time. I agree with those who say both use solar time.
