I like the difficulty, It's not that hard but not super easy.
What I would like to see is for the footsteps to make more noise, it's really easy to be ambushed from behind by some monsters. Some games have a higher sound and IMO it was a nice feature, really helpful. In this game is hard to listen to the footsteps.
For the OP, try to hold the shooting button if you are not doing it already, some weapons have a better performance like this IMO, for me it was something that I had to adapt as some shooters I played were different in that regard.