I did a image edit to explain Full SBS easier.
This image is what the PC reports, the PC always thinks the movie is 2D, the TV will merge these two images into 3D. The PC will thus never be restricted by 3D setting limit such as 1080p23.
http://i.imgur.com/um8Lal8.jpg
Regarding the "mountain effect" on the image, this is the industry standard, the more you stretch the images from eachother (2D and MVC) to each eye the more of a 3D effect you get but also introducing other weird things such as crosstalk. Most TVs have a "3D depth setting" which will basically try to stretch these two images even more in frame-packed or SBS.
also yes, windowed mode doesn't work that well since there's space in the middle and when the TV merges them it becomes buggy, fullscreen is needed to avoid scaling issues.
Either way i can't get Full SBS or Framepacked 3D to work with MadVR as my post above states.
Edit2: When I mean "stretch" it's basically adding distance from both images, 1 image = 1 eye, add too much distance between them and your eyes will become asymmetrical, lol.