Yeah, the chattering thing is a skin friction problem. If it were a dust problem, then you could notice tiny scrape marks on your brass, and it would feel gritty as it went in, not the jump and chattering.
When is the chattering starting? Usually for me, if I have a heavily expanded case, then it would start when I have 3/4's of the case in, just near the case head, where most expansion has occured. If so, then it has nothing to do with the mouth or expander ball. In this case, you need more lube down at the neck on the outside of the case. I don't think the expander ball creates enough force to make for very sticky removal. I have though, pulled out an expender ball from a 30-06 die, which was on an unclean case I was resizing, all the grit inside locked onto the ball, and pulled the whole thing out of the sizing die.
So if is on first entry, or the last part exiting, then it is in fact the expander, and if it is, you can brush out the case mouth with a nylon brush, and also, as you have already done... more lube.
From what you have said, it is upon final insertion, or the first part of extraction that it is happening, then it is the expansion near the case head, or case wall, and if they are already tumbled, it is a lube problem. If you use a thin type of lubricant, like a spray on, you may want to switch to something a little thicker, like a gel type lube, or a wax.
I use the RCBS case lube-2, and it has run through some pretty damn hard cases. I had some range brass I picked up that was who knows how old (WRA headstamp)... that I actually scraped some brass off the casing because they were so hard to size. (I know, I shouldn't be loading them in the first place, but other than that, they look healthy) But with that lube, I had no chattering of any kind, then still went smooth.
