I actually didn't know about the existence of the plugins, thank you for the info!
However, my issue is a bit more than my (undoubtedly incredibly shaky) hands. When I drag my pen across my tablet, Paint.net literally won't start drawing until I get a certain distance from the point I made contact, at which instance it'll connect a straight line from there to the new point and then start drawing as normal. I wish I could give a video of this to make the point clearer, but I lack recording software.