Semi, I'm not sure this will be helpful, since you've had CH for a long time and so you might be describing something more unusual than what are called "shadows" here -- ongoing pain at a lower level than a full-blown attack. There is some advice about shadows (under the heading Shadows) in this document, toward the end -- https://clusterbusters.org/forums/topic/6213-basic-non-busting-information/ -- and there is a lot of discussion of shadows in various threads. You can see that discussion by typing shadow into the search bar that is at the top right side of every page. There's a lot there, but you can skim the summary text to get a sense of what the posts cover.
If you're just looking for SUNCT/SUNA information, I hope someone will respond directly, but you can also see the posts about them by putting SUNCT into the search bar.