Yay!! Works! At first it didn't so I:
1. Went into SteamVR settings and turned off "Motion Smoothing"
2. Double checked that "Use legacy reprojection" is off.
3. Confirmed this was the case for both all and specific star wars app.
4. Ensured latest GeForce Driver.
5. Launched game.
6. Went into VR settings, all looked fine - i have the snap view stuff turned off.
7. Went into Video settings, turned off the Vsync. This may be most critical thing.
Launched training - no more continuous judder of external objects as you steer the ship around! (the duplicating frames problem).
I still have a single stutter every few seconds as I fly around - it feels like a loading stutter - but I have everything set to ultra, so i'm hoping this is a too high quality/loading issue (although my rig is pretty powerful) and I can see it is also displaying on my screen as well as VR, so maybe that's taxing the system.
My kids school just closed due to COVID. They miss their friends. This game should buy us a few hours of cheering them up, that's for sure! Pew pew!
Thank you @Straatford87 and crew!