Wynne, I try to not rush any step in my reloading procedure.
As for spring back on brass, I firmly believe that it happens and that it is due to work hardening of the brass during the reloading and firing. I have experienced inconsistencies both in shoulder bump (measure able by me) and neck tension (just going by “feel”).
I don’t have any idea whether holding the brass compressed for ten seconds would cure spring back, but my gut feeling is that it would not be consistent. If someone has tried this method, with measurements, and it worked, please let me know because that sure seems easier than annealing cases.
Maybe I overdo it; but I Anneal cases every three firings.