TP-LINK TP 9980 Max Speed on VDSL Vectoring G.993.5

Is anyone using the TP 9980 on a ITU G.993.5 Line and getting decent speed out of it?

I'm using the DSL firmware dsl_vr9_firmware_xdsl-05.07.06.0A.00.07_05.07.01.0C.00.02.bin but can only get ~23Mbit.

Same as before on G.993.3 (VDSL 2)

DSL connection itself is:

Data Rate: 109.926 Mb/s / 38.448 Mb/s
Max. Attainable Data Rate (ATTNDR): 113.648 Mb/s / 41.023 Mb/s

I'm not sure if that's (the 23Mbit) the limit of the device or a configuration issue.