Thanks RJK_ ! I already tried Unreal 3 and 4 and Cryengine but i did not think of Unity ! Which of course is very popular in game development. So i copied the profile for Life is Strange: Before the Storm which seems to be a 2017 Unity game and……bingo ! G3D working. Still tweaking (for example 3D Strength bit higher) but looking very promising. Thanks again !
For other walking simulator fans out there, i usually like cinematic screen with head tracking off better than full VR. Image quality is usually better and sometimes a mouse is nice instead of head tracking.