I'm so glad I did! The small Lady Cup does everything I ever wanted a cup to do. It stays put, insertion and sealing are a breeze, and it does not leak! Seriously, I had to empty it in a public bathroom today, and it was out and back in in under 30 seconds. Retrospectively, I think that the problem with the large LC was that it was a little too snugly fit for me, which forced it higher up in my vagina. Since my cervix is tilted, I need my cups to ride low in order to catch the blood. The small LC has a small enough diameter to ride low, and therefore it stays below my cervix.
Thanks for all your help and support on here. I never would have even considered a different brand of cup had it not been for this community.