As a default line-up I'd play Quan Hô at PG and Song Youying at SG as the latter has a bit more JS/IS, but they are similar so it's not going to make a big difference.
I wouldn't worry about the position your players are listed, it's main purpose is it shows which salary position formula is being used for your player. It's only a rough guide, and it's perfectly fine to play more than one player listed as a Point Guard.