Tip: Telephoto Lens "Creep"
I heard about a few photographers complaining about "creep" while using their telephoto lens. In their frustration, they are quick to blame the ballhead or tripod for this apparent creep. Sometimes, it is true — the ballhead simply can't bear the load or the tripod is less than sturdy. However, a great majority of the time, most of this creep is a result of flex that exists between the camera, lens, lens collar and lens-collar-foot when forcing the camera in place for composition.
So try this instead: When the situation permits, grab the parts that are as close to the ballhead as possible, like the lens foot, and use them to make the fine adjustments and don't let go until the ball is locked. This will reduce the amount of "creep" significantly and will also put much less strain on your expensive cameras and lenses.