EE rendering and vertical skewing (and motion sickness)

Looking for some help configuring EE. In short this engine gives me major motion sickness that I don't get on any of the other source ports I've tried (prboom, dsda-doom, gzdoom, zandronum).

One part that I have since figured out is that the FOV in the eternity engine seems to be off by about 20 degrees. When I compare screenshots, Eternity engine's FOV-140 is identical to fov 120 in any other source port. Or to put it differently, the default setup for the engine is 100 Fov, which is actually a fov of 80 :(

What I haven't been able to figure out though is why (maybe it's as designed?) the vertical mouse look causes the old school skew-scrolling that you don't get on most of the other OpenGL renderers. I'm pretty sure that's the second component of my motion sickness, cus that stuff is a shortcut to vomit town for me. But disabling mouselook only partially solves that issue ,as you can still see the distortion depending what you're looking at, and from where.

While I'm at it, I'd prefer it doesn't cap my vertical look to whatever 30 degrees or so that it does. Ultimately all of this is because I like to look around at the environment and design when I'm playing rather than just blast through at maximum speed.

EDIT: I'm pretty sure everyone knows the skewing phenomenon I am referring to here but just in case, here's some shots:

Eternity Engine:

GZDoom

Eternity isn't an OpenGL renderer, it's using a custom software renderer that's functionally similar to Doom's. It only uses your video card for drawing that software-rendered output to the screen. There's no way to eliminate y-shearing without completely changing how the game is rendered. Y-shearing only happens when using mouselook (or keyboard look I guess) to look up or down, though.

A hardware renderer in EE would be great to have as an option someday, though personally I don't think I'd want to use it most of the time, as software tends to just look better to me.

That's a shame. I'm all for going for a vanilla esque experience when it comes to shading, filtering, resolution, etc etc, but this y-shearing makes me queasy so quickly that I effectively can't play.

But, is the y-shearing 100% caused by mouselook? I tried turning off mouse look but it didn't immediately help my motion sickness. But if it's completely prevented by mouselook being off I can give that a shot.

Yes, y-shearing only happens when you're looking up or down.