No creep on mine. Not only that, but holding it and swinging, I need a lot of centrifugal force to get the zoom to extend - softball bat swing type force takes it to 50-70mm but not all the way out, a tennis backhand volley swing and the barrel doesn't move.
Fascinating description of your "centrifuge"-test - makes me wonder what
else you use the camera for - besides participating in sports ^^
brilliant!