I've had a bit of luck finding youtubers/twitch streamers who are content to let some dead air go by if they don't have anything important to say, and definitely don't do any yelling or screaming. It's a real nice change.
Partially I'm just making this post to share the few I've been watching the most:
Jagged Appliance, a Supreme Commander player and caster.
Growling Sidewinder, a DCS pilot who goes into detail about dogfighting and BVR fighter jet tactics.
Tasteless, a Starcraft caster who plays Brood War and chess in the Korean timezone.
I think he secretly has a leftist bent. If you listen to the NLSS in particular, he seems to use all sorts of language that you could consider to be vaguely leftist coded -- stuff that is associated with various bits from "dirtbag left" and adjacent content like "you love to see it, folks", "large adult sons", shitting on WSB, etc.