MIDI Signal go through Ableton but not in individual tracks

Hi,

I'll start first by explaining what I want to achieve with Control surface studio. So, I'm trying to build a set up for orchestral composition. In "virtual orchestral music", dynamics and expression are very important to try to emulate human playing.

So, my goal here is to set up 2 sliders at least which control dynamics and expression on every VSTPlugins on each track.
To do so, I assigned VST Dynamics and Expression (most of the plugins I use are in Kontakt) on the two first knob of the Instrument Rack. I then created a script which enables to control those two knobs only on the selected track.
Until then, everything is fine.

The problem is that we can't map all the parameters of Kontakt VST's into the Instrument Rack.
To control those parameters, I must assign to each of them the midi CC's of the two faders, inside Kontakt.
But when I use the custom script I receive midi information in ableton but not in the tracks. For example I can assign MIDI CC of the sliders to the play button but Kontakt does not receive any MIDI signal..
When I change the script for the default Launch Control XL everything works fine, it's like the custom script is blocking the MIDI signal through the different tracks.

So to resume I would like the script to do so:
Mode 1: Control the two first nobes of the Instrument rack only on selected track
Mode 2 : Use CC#77 and CC#78 to control pre-mapped parameters inside kontakt only on selected track.
I've attached the script in text format below

I hope I'm being clear enough, don't hesitate to ask me questions if not.
Thank you,

Quentin.