TouchOSC Zoom Control: Only increasing values despite bidirectional movement

Hi everyone,
I'm struggling to get my Zoom control working correctly via OSC from TouchOSC (MKII) to Eos Nomad.
I get help from gemini and chatGPT but they rarely agree. And sometimes, they are even more lost then i am... Anyway...
  • Address: /eos/wheel/zoom (I also tried /eos/param/zoom)
  • Message Type: OSC Message with a single float argument x
  •  Whether I move my fader up/down or rotate my encoder left/right, the Zoom on the Eos command line/encoder display only increases. It seems like the console is only receiving or interpreting positive increments.
Is there a specific Argument string or a "Scale" setting in Eos that I am missing to allow bidirectional control for parameters like Zoom or Iris?
Please, remember that i'm not an and engineer.  I try my best to understand but my knowledge is limited regarding OSC messages...
Thank for your understanding !
Pace