Yeah, when i was standing in the queue, the IO did not look like a friendly guy, should have switched queue. But I thought I have nothing to worry about since I was out for 4.5 months.
Yeah I should have sticked to 30 days. But why there is not a clear rule about how many entries is allowed? Never seen it in any other countries. Just entered China 3 times with free 15 days, and the officers where strict especially in the western state and checked a long time, but always friendly and civilised.