Sorry the internet is down in this 3rd world country I’m currently in so can’t watch the video unless I want to use data roaming 
Will give it a watch later in the week when I’m back.
Here’s a question for you both though. How are you moving your player object? I’m using pure physics so I’m using ‘set physics angular velocity’ for rotation and ‘add impulse’ / ‘set physics linear velocity’ for the forward thrust.
Just wondering if it’s to do with physics as that uses a fixed frame rate whereas the camera movement would be running off the tick frame rate. I think…that’s how Unity worked anyway so I’m assuming UE4 does as well. I did try reducing the substep timing but it didn’t make any difference.