dburne,
I am using the Vive.
DDSSTT,
The problem I am seeing is not a pilot position problem. It doesn't matter where you sit, everything is about 75% scale. As I look down, my butt is inside the seat while my head is almost off the top of the headrest and everything is small. The joystick looks like I could barely fit three fingers around it, the foot pedals are halfway up my shins, etc.
Interestingly, the graphics in the HUD seem to be scaled correctly, which makes them not fit inside the 75% HUD frame. I've moved my viewpoint all around and the only way I can see all of the HUD display at once is to put my chin on the dashboard.
Again, the problem I'm having isn't a position issue, it's a scaling issue.