Try messing about with Vsync and worker threads. I think one of those made my game more jittery in either Darktide or Vermintide 2. I know I've got vsync off in both games but forced on in NVCP. Worker threads I seem to remember people saying to both raise and lower it for Vermintide 2 to make it run smoother, there didn't seem to be a one size fits all answer for it.I was up until 3 playing this yesterday, really enjoying! Only used my Ogryn so far but being able to turn him into a melee wrecking ball is great. Still need to workout the best build but the game is fantastic. It could do with a few more maps but overall I'm happy I've revisited.
Generally played with competent randoms which helps loads, even at 4th tier, although a few rounds were comical and the team was wiped so quickly. My mates have jumped back in however so I foresee many more hours krumping in the name of the emperor!
The psykers are fantastic to play with, the crowd paralysing skills are incredibly effective, so much easier to cope with the plague hound packs.
One thing I note is how demanding the game is, have mostly medium/some high settings at 1440p and while it's generally achieving 90-120 FPS at times it drops down to the 70s. I'm not sure why but the game just doesn't feel as smooth as it should, could be a result of recently having only played on my OLED or at higher FPS on the monitor.
I've been playing some Vermintide 2 since they've released the new class on that (when the game wants to work) and I'd forgot how much harder it is than Darktide IMO.