yeah, I remember the older DX9 not having the stutter, I thought Steam made it mandatory to use 11 or 12 a few years ago. I'll see if I can get it to launch in 9.
Edit: Doh, in my searching for a solution it looks like I was trying to run DX9 version from Steam 5 years ago...looks like Steam only has the DX11 files in the game folder.