A 2013 MacBook is not going to be a great machine to stream with.
RGBA is definitely NOT recommended. Suggested is NV12. 709/Partial, but 601/Partial is also OK.
https://obsproject.com/forum/resour...t-color-range-settings-guide-test-charts.442/
For local recordings either use the simple mode and indistinguishable quality, or choose the x264 encoder with CRF rate control and choose a value between 16 and 23 (lower the value, the higher the quality) and tweak until you get results you like. CBR rate control is primarily for streaming, and it will inflate the size of your files without providing any quality advantage.
2500 as a bitrate is fairly low and won't be particularly pleasant to look at, especially if recording high motion content.
15:28:59.521: width: 2560
15:28:59.521: height: 720
That should be a standard resolution like 1920x1080 or 1280x720. Not sure if you intended this.
60fps is also quite demanding, I would suggest you target 720p30 on this hardware.