When working with low poly models I've found that they're prone to heavy distortion like in the image above, even though it's UV map is square and clean (IMO), simple objects like this distort heavily along where they're being triangulated. However when I subdivide the exact same model the UV map's distortion is fixed, I assume because of the extra polys?
Why does this happen? and is there anyway I can fix this distortion without subdividing/increasing the polycount. Any help would be greatly appreciated!