TGM
With IB they set your server when you first join, depending on where you're based, unless you specify the server. You can change this at any time and as often as you like, but only over the weekend. The US server shuts down at around 23:45 EST which is after the close of the am session on the HKFE, and it's normally up and running for the pm session, so you should be ok with that.
There is no doubt that for US data there are issues with the asian servers, so if you intend to trade these markets then stay with the US server. I'm not at all sure about Eurex, but I'd guess that again the US server would certainly be better than the asian ones.
Hope this helps
Q
PS - good luck with the HSI, it's a thinly traded volatile beastie with sometimes frightening spreads! 😱