Can you elaborate on how you used the item you linked? I ask because I too adjusted the glass myself and re-tightened. Dealer also took a shot at it. Both times it got a little better but definitely didn't solve the problem. Struts are fine and window opens/stays open as it should.
As far as I can tell, the only issue is that even with the tailgate firmly closed, there is still maybe a 1/4" of "play" in the window. If I try to open the glass with the tailgate shut for example, it can come out that little bit and so when I drive over bumps, that's the rattle I'm hearing.
I was thinking of trying to fashion some sort of rubber "bumper" to sit between it and the spare tire holder to keep it flush and closed tight. Wondering if this would work better...