So, few issues with your request here.
First, and foremost, xSplit is not open source. They do not provide source code for any of their components.
Second, you are operating under the assumption that there is something wrong with the network code in OBS. There isn't. See the detailed explanation
here on how OBS is not capable of being the cause of connection issues. xSplit uses things like dynamic bitrate adjustments to try and mask connectivity issues from the user (for better or worse) in some cases. We don't do that currently, but it is an option that someone has started work on. You can see further details here:
https://github.com/jp9000/obs-studio/pull/1086
Lastly, I hope you realize that this kind of request can come off as extremely insulting to the people who have poured countless hours into providing OBS for free for millions of users. Only a very tiny handful (who are very vocal, no doubt) of people have connectivity issues with OBS, and to date, not a single one that I have seen has been caused by OBS itself.
EDIT: Almost forgot! If there's any doubt the network code in OBS is rock solid, check out this:
https://twitter.com/przemyslawpluta/status/904972386512056321