Express VPN in Guangdong area, China last week
I was in HongKong and Shenzhen ( Guangdong area, China) last week. Before I went I chat to their operator and they suggested a few of their points to connect when I am there. Namely HK4, HK5, Japan and LA. I saved them as my favourite and had no problems with FB and Gmail.
Just chat with them and they can assists you. I was really frustrated with not being able to receive Gmail when I am in China before.
Hope this helps.