I found a workaround to the choppy frames: I'm using my gamepad's analog sticks for viewing. The frames are smooth throughout the movement range and only stutter a bit when the right stick comes to a stop at its center. I disconnected the gamepad, thinking that there was a conflict with the mouse when both are plugged in, but the view movement still stutters with the mouse.

I prefer to use the keyboard and mouse for this type of first person POV game, but it's no big deal now that I can enjoy the game without the distracting choppy frames. I don't have this issue with Fushimi Inari or the Iceland game, though.

hmm I haven't heard about this issue before, you can try messing around with 'look smoothing' in preferences, otherwise I think it might be something to do with your hardware