For years (about 20) my CH presented itself almost exactly the same way year after year ... that is until this year. For whatever reason, the pain, although very dull, seemed to linger longer no after the peak of the attack. This beast has a mind of its own. I have noticed the sinus crackle over the years but it would usually happen as my cluster was subsiding and the clogged / draining side would reduce pressure, so not sure if that is what you refer to. You may want to get a scan / MRI to rule out anything else if the difference seems to be that noticeable. Best of luck and may you see some relief soon.