I think you're overthinking the problem. Doom has a really deep view-bobbing motion along with a slow and deep, not quite in sync weapon bobbing motion. There's

I think you're overthinking the problem. Doom has a really deep view-bobbing motion along with a slow and deep, not quite in sync weapon bobbing motion. There's no looking up or down, crouching, leaning or in any way not looking directly straight, and Duke Nukem 3D which had all of those things never seemed to bother any of my friends like Doom did. I've always assumed it was the view bobbing/weapon bobbing combo, though maybe I'm the one underthinking it.