I recently booked Mrs AITF TXL-TPE rtn via HKG in J on BA for €1.900 for late November.

Interestingly enough on the connections she has J is significantly cheaper than WT and WT+ on the outbound at the moment!

Random search for dates in mid-November offers BA J TXL-HKG rtn for €1.733.

DUS probably about the same, I imagine, and both are apparently well-regarded for B2B (although I have no personal experience of this, being a Berlin resident!)

EDIT: Just noticed you are looking at October. Seems you would have to wait until November 01 for the outbound to get this price...