No initial player controller rotation, ok.
But the delta (change in player controller rotation) is making it over.
That is yet another issue I have seen, where using ApplyHmdRotation() is added to the Rift plugins internal rotation, minus the initial rotation. End result, unless the Rift & spawn rotation are the same, you will end up being a certain amount of degrees off.
i.e. If the player spawns facing 0, all is good, but if the player spawns facing 45, your view will always be 45 degress off.
But again, unless the binary version of player controller is wrong or you’re using a custom player controller, that shouldn’t happen.
Oh, btw, change your post is in the wrong place.
Change it from an answer to a comment with the little drop down menu.