Ossom MOD and thank you very much killa12222 !
So, from my testings and checks with mediainfo, it seems that 4K is still limited to 50Mbps, but the Audio is in fact 192Kbps now.
For 1080p @ 30 fps, it is 30 Mbps & 192 Kbps audio, so spot on!

As for 1080p @ 60 fps it is still limited to around 28 Mbps and 128 Kbps Audio, so I presume this one wasn't touched.
I think maybe I missed something else that I may have needed to do apart from dropping the modded apk?
Is it possible to know exactly what to modify inside the apk so I can play around and adjust it to my needs?
Thank you very much!!
PS : Running stock TW N9005XXUENB3.
PS2 : Interesting enough, I edited the media_profiles.xml and the 4K is now 80Mbps. Still would like to know how to edit the camera.apk to change the settings myself.