Sure. We are seeing 2 things:
1) When we upgraded from 7 mode to C-Dot, the size of our daily snapshots for our biggest volumes increased by a factor of 10, a huge increase (hence an oversized snapshots issue). We've yet to understand why.
2) On other volumes, we are seeing deletions that don't tally with snapshot sizes. eg 100GB+ of data deleted, but resulting in a 100MB snapshot (so an undersized snapshot issue).
I won't go into too much detail at this point, as we are still undergoing testing, especially with the second issue that has only recently come to light.
This is why we are looking for some deepdive documentation to cement our understanding of snapshots at a technical level, so we can better engage support.