Lots of good advice already...
I shorten the stitch, and backtack the seams.
Another trick I learned was to fold the paper along the seam line before trying to tear it away. (I haven't tried vellum yet; will have to do that.) The fold has helped. Also you can lightly run the tip of a seam ripper along the seam (careful not to catch the thread :oops: ) to help cut the paper. Even with regular printer paper this works wonders. Oh, and I keep tweezers handy for the little pieces that do not release.
We'd love to see your blocks :thumbup: