Well, I try to keep this all on one page with updates. However, in this case I figured I needed to leave the old message there as part of my application for Professor of Divination.
Yesterday, I speculated that it looked like a sixth cluster should have CFC 2-6-7, and that the number of completed ebay sales hinted (dangerously) that we seemed to have been short of reports for autos by Aragog, Petunia, Pomfrey, Sprout, and Ginny. Those might be part of an unobserved sixth main cluster of cases.
So pinksamstar came through and reported a new case breakdown with exactly those eight cards.

We already had a cluster with those five autographs. So I can't say yet whether this cluster should be called "F" or "B2". Memorable Moments seemed to have 6 autograph clusters, but two of those had subclusters of different costumes/props.
There don't seem to be enough C1-C6-C9-C15 or P6-P7-P8 yet, and probably a bit too many C16-C17 and P9 for them to be included in every case: 115 copies of P9 can't cover every case of two "100-case" clusters. Maybe some of them are displaced by P6, which hasn't shown up in any posted breakdown yet.
But here's the working assumptions.
A - 2 cases - Lockhart, Myrtle, Pomfrey, Vernon, Ginny with CFC 1-3-9 and P8
B - 2 cases - Aragog, Petunia, Pomfrey, Sprout, Ginny with CFC 4-5-8 and C10/P3
C - 2 cases - Dudley, Percy, Sprout, Vernon, Ginny with CFC 4-5-8 and C13/P7
D - 1 case - Aragog, Lockhart, Myrtle, Sprout, Vernon with CFC 2-6-7 and C9
E - 1 case - Dudley, Percy, Lockhart, Petunia, Ginny with CFC 1-3-9 and C1/C6/C15
F (or B2) - 1 case - Aragog, Petunia, Pomfrey, Sprout, Ginny with CFC 2-6-7 and C10/P3
Because of the "short" props and costumes, I now speculate that there's a seventh and final cluster (or several subclusters), which would include:
C1-C4-C6-C9-C11-C12-C14-C15 and two from C3-C7-C8
P6-P8 and one from P3-P4-P7
A seventh cluster (or naming "F" a subcluster) would break the current symmetry of the CFC cards. Let's hope we get breakdowns from some of the people who bought five or more cases.
Still, I'll post this and wait to see if some cases show up that are exactly like this. Divination isn't nearly as convincing if you wait until after the events before you predict them!

**NEWS FLASH**
I re-analyzed the breakdowns for Memorable Moments, and it looks like the numbers come out almost perfectly if you assume that there were five basic autograph clusters and two sub-clusters for each autograph cluster. Of course, they might find a different arrangement was convenient for COS.