David, the ineffectiveness of the creeper gizmo was related to me by another member who found it ineffective. The largest batch I have mixed so far is ~950gm of dough and it didn't seem to creep up the center shaft. Hopefully sooner than later, I will mix up a 1500gm batch or so to see if it does.
Looking at the dough creeper gizmo, it is made of a flexible plastic. I can visually dough coming up the column and just pushing it aside. The design may be sound but the materials they use don't appear to be. If it was made from a much more stiff plastic or even metal, I bet it would work fine.
If someone has the tools, know how, and interest in replicating this piece using SS, I would be more than happy to put it to the test.