I actually liked the look. Probably reduce the diffusion a little and it's all good.
I don't really get why you are trying different resolutions at all. 1920x1080p & 1280x720p are good 16:9 standards. You can adjust other display aspect ratios to 16:9 in Vegas using pan/crop. Well 16:10 is fine aswell, but please don't try resolutions like 1280x1024 which is also available in SA and would be 5:4 ...