The issue is more likely your bitrate being sent to cb from your obs, 1600 is way too low, thats a system issue or network issue.
Pull up task manager while you are trying to stream and check if anything is close to 100% usage, you might need to right click the headers in the columns to add in GPU if it's not already there.
Another thing you might want to check is system temps, that can effect system performance and can result in bitrate issues, you can do that with a program called openhardware monitor.