I've been doing some runs of the Nova mission pack both on brutal and normal. It's shorter than the regular campaigns which is nice because those are a pretty big commitment both to learn and to run.
Most of the missions in the pack are fun for speedrunning too, there's some really cool strats in there. However, the second mission is 15 minutes (real time) and can't be finished early which is pretty annoying.
Here are my PBs/world records. They aren't quite where I want them to be but I kinda burned out on the runs so these will be standing for a while:
I also did a few individual mission runs but they really aren't that different from what you'll see in the full campaign runs.