Thanks
I tested the PARAbole and it worked rather well. The geometry is now mainly ok. The result is correct although not as good as my other TV which is a more basic 19" curved Samsung TV.
As a side note I also disconnected the SVM feature (Scan velocity) that tended to make the picture expand when there were too much white (probably a great feature for movies, but not for old gaming). I will give credit for this to SegaHolic from youtube.
https://www.youtube.com/watch?v=1YGy3FuAxfA&t=1388s