Good morning 
So I have check the fader-commands and the faders 1 to 8 and 9 to 16 are exactly the same MIDI commands. I have test it in a new preset / project.
YOU CAN SEE IT IN THE PIC ON THE YAMAHA 01V96 PORT!
I moved fader 1 (Port 1) and fader 9 (Port 2).
I have compared my preset (it is attached below) and there is everything as far as good.
So the thing is now, that BMT 1 and BMT 2 have to set right in Ableton and the mixer have to send with the right selected channels. I changed the Midi channels in the mixer from 3 and 4 to 1 and 2.
There are no ERRORS shown:
So I do not understand it 
For Channel 1 - 8 everything is good and for Channel 9 to 16 it do not work.
Here is my Ableton setting (alle IN and OUT are identical):
So maybe it will help you to get a better view into my setting.
…It would also be interesting, if the person with the DM2000 can use more than 8 channels or also only 8.
I WILL KEEP GOING ON
Here is the preset:
01V96-Ableton-04-23_1_TEST.bmtp (111.4 KB)