Abrupt Changes to Environment Lighting Direction in ME2 on PC (RE-POST)

Reposting this question since my original request for help was ignored completely. I'd really appreciate some assistance here.

So I'm on my second play-through of ME2 and I have noticed some kind of glitch that seems to be occurring with the environment lighting. First off, I'm not one of those weirdos complaining about the lighting being "too dark" in the game - I think it looks awesome. What's bothering me is that almost every time I move around, during both gameplay and cutscenes, the lighting direction changes abruptly. It's like it's taking a while to realize that the lighting pattern is supposed to have changed and then it just forces the lighting shift. It not only looks very unnatural and damages the suspension of disbelief, but also makes many parts of the game just really weird to look at.

I've tried changing just about every application setting in Config; Dynamic Shadows on and off (I prefer to keep those off in all three ME games as they just make everything look weird and shimmery), Light Environment Shadows on and off, High Quality Bloom on and off, Spherical Harmonic Lighting on and off, changed the number of cinematic lights, you name it. I've also tried many tweaks in Coalesced.ini and GamerSettings.ini, as well as changing some settings in the Nvidia Control Panel, and nothing has worked to fix the apparent lighting glitch. Has anyone else run into this and does anyone know of a way to fix it?

My specs:

MSI GeForce GTX 960 Graphics Card (all the right drivers are installed and up to date)

AMD FX-8320 8-Core CPU

16gb RAM

Windows 7 Home Premium, 64-bit

My version of DirectX is 11, I think.