My new UV trem was very stiff also. *I followed all the set up tips in the tutorial here on the site to make sure everything was set up properly and the I proceded to abuse my trem violently for awhile, just playing
Van Halen style. *After just a few minutes, my trem felt much more fluid. *The springs will develope a memory of sorts, and become accustom to staying in one position. *They need to be flogged every so often if you don't use your trem much. *I don't use mine much at all so I have to make a point of abusing it every few weeks. *Once broken in, you whole guitar will feel much "looser", string bends will be like butter. *I would worry about the creaking so much at this point...just make sure that you double check that everything is mechanically sound before you go off on it.