I think it's an intentional part of the engine.. so when you're say in a corner, and the camera is squeezed up so as not to clip through a wall, you can see what's going on without 90% of your screen being the Boss. It's going to be as deeply ingrained in the engine as drawing the models itself. Don't expect a way to change it either.. I think that's been the design decision since SR1 (can't confirm 1 but very likely). It's a standard of all games with third-person over the shoulder camera.
Pull the camera back a little, or shove it almost up into them to first person, sorry?
(Volition would have to post to be sure, but it's a deep-built thing I'm guessing, and is one that's come up with every single game in the series)