Sony Vegas Pro 13 Rendering Issues?

So lately I've been interested in recording and uploading gameplay regarding a large variety of games: cs: go, minecraft etc. What I would notice after rendering my videos and uploading to youtube is that the quality seems to be degraded as when I record it (I record at 120 FPS locked), the raw footage is very vibrant and all-around amazing. Also, when rendering in Sony Vegas Pro 13, the preview is EXTREMELY crisp and beautiful.

(These are the properties for the RAW recorded videos for anyone interested: Sony Vegas Pro 13 Rendering Issues)

As stated before, the raw recorded videos are rendered using THESE settings: Sony Vegas Pro 13 Rendering Issues - 1

These are my specs to whom it may concern:
 - 2

But in the end, after rendering the videos and it's done processing and uploading to youtube, I find the video is extremely pixelated at some parts and is not the same vibrancy as when I recorded it, does anybody have any suggestions?

I'm open to all ideas.

I don't have any experience in that particular program, but perhaps you could render your videos at 1920x1080 (Full HD) in 60FPS, then try re-uploading it to YouTube, making sure that you set the player to 1080p60. Also, when playing it back on YouTube, make sure that you're playing it in Google Chrome to view it at 60FPS, and have enough bandwidth to stream Full HD videos (I'd recommend at least 10Mbps). 60FPS is the highest FPS that YouTube currently supports.

I think AVC is partly supported by YT but not fully as much as the recommended. The default recommended by YT is MP4 for format. You can find more info and exact specs here >>>