1- Set your base resolution to your monitor, or whatever you're playing at. Use the downscale dropdown in the Video settings to do a full-scene downscale, which allows elements to alias into one another, maintaining better quality.
2- 1850kbps is going to provide middling-poor video quality at 720@30fps, much less 60. Severe artifacting, and is going to look like complete crap. Yes, it'll be watchable without much buffering at all. But dropping even to 30fps will allow a much better bpp density and provide a clearer picture; streaming 60fps is mostly numbers-wanking anyway outside of some specific technical use cases (sprite blitting on retro games for example).
You're using poor settings, and defending them as 'nobody has complained' when they will provide a stream quality poor enough that you may as well smear vaseline on the screen unless you're just playing Hearthstone.
So yes, good luck there. You're going to need it.