Thanks for the suggestions!
The network latency emulation is turned off. I tried changing the update frequency on the actor like you suggested, but I didn’t see any changes no matter how high or low I set it.
I tried having the movement code run on both the server and client at one point in the past, but it caused a far worse issue – the pawn would start to turn before being forced back to looking straight ahead. Tried it again just now and same result.
It may be a latency issue but I get the feeling it’s not since if I simply move side to side there’s no jitter or lag. It’s only when I use the thruster-based controls that control where the character is looking.