Streaming TV channels quality is terrible

I think I'm in the right place, I'm looking for help with the TV channels that you can add to plex.

I enjoy watching shows on TheCW, ABC, and CBS

CBS streaming quality is pretty good.
ABC - it's alright, but it could be better.
CW - horrible quality, the audio is tinny and the video is so pixelated that it's impossible to watch.

I have tried streaming on my computer and to my Chromecast (2nd gen) the video quality is the same on both devices.
I have tried two different networks, my local home network and on a friend's network accessing Plex remotely.

There's no buffering issues, both internet connections are 100mbps or better, the bitrate sucks and there's no HD/HQ stream options.

Any tips?