JJD - Indeed I will~! I just need to rent tripods from those "classmates" when I go for another birding trip~! Interestingly my travel compact (Fotopro C5i), which has a softer type rubber tip, does not creep when fully extend and only slightly when loaded.
PS: My room's wooden floor is only few months old and polished, that could be the reason. Creep gradually reduce when I retract leg sections, so I guess it associates with tiny tolerance of leg lock/sections?
Rick - I agree with you, but that 42mm leg of Gitzo 5, when stretch all the way and compare to my 34L, just "feel" a bit more rigid when you grab the top legs and try to twist it cw/ccw. As for real-life performance on this matter I can try it out later.
BTW, it really freaks me out when I saw those ppl with GT5541 just carry their whole rig on their shoulder while moving - I hope I will never see a 15k rig falling in front of my eye....