You know your onions. I was told in no uncertain terms by a visa agent I have used many times before in HK, that even if I presented myself at the wan chai china resources building and asked the chinese office there, they would still refuse. The visa is issued by the psb on the mainland, not in HK and it is at their discretion. The woman told me to simply avoid trouble, get a new blank passport with no records of entries to China, old one gets cancelled, and in their logic....then I have never ever been to China, lol, the mind boggles, but as we know in Asia things are not black and white and often mixed around...or arse backwards logic as one guy I knew liked to term it, lol