Why is there visible jitter and jerkiness in game?

What is the likely culprit causing slight jitter and jerkiness in my game when I my character rotates?

I’ve slowed the max walk speed to 50 and the base turn rate to 10 as I need an archvis type walkthrough although showing events that are triggered via gameplay so matinee/sequencer not an option?

I’m running a gtx1080 to boot.

Would appreciate some input to help get my game smooth.