I have that same problem with commas , in part because I can a handful of rules. Most likely the rules about commas that I enjoy most. The other challenge I have is this ....(hopes of getting everyone to read that as a dramatic pause, which rarely works.). I enjoyed your view on exclamation points.
Random commas? Cool!
I use the ... in the same way - a dramatic pause or as a trailing thought. Not sure what they are called but I like them!