Since I was unsure about if I had done UDP right, I wanted to get hold of a good testing tool. Got linked this little awesome tool by Johannes (cheers!) that seems to be exactly what I’ve been looking for!
All tests were conducted using two clients on localhost, and applying all settings on all ipv4 sockets, both inbound and outbound.
Results are a available here as a raw .txt file since I cba to format it in html for now. Further tests will probably end up in the same directory later on, so I might add a link to it on the right below the MS links.
TL;DR of the tests is that UDP is working significantly better than TCP using certain options, proving that the implementation is working to some degree.
The tests also made a point that client simulation and control is needed to overcome the greater network issues.