I know you already found these but the Odd Soul stems are on the "weareoddsouls" YouTube channel, and hopefully they are higher quality. Obviously you can use a youtube video to mp3 (or other format) converter to get the audio files. https://www.youtube.com/user/weareoddsouls
As for the Monument stems, I found a torrent: (https://now.bt.co/bundles/mutemath-monument)
When Karma Fields released the first album, there was a Bittorrent campaign that included a downloadable version of the album video. I'm not 100% sure but it might be an improvement.
You can download it as part of the BitTorrent for A Color Map of the Sun, includes the entire visual project https://now.bt.co/bundles/7205c6cdc81f52cd22170627b1844bf04c3f7c72031684ab50ec53fe5329ace1
Install a BitTorrent client on your computer, visit Jarreau Vandal's BitTorrent Now page, give him your email in exchange for the torrent file, and open the torrent file in your client.