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The easiest way to see that sand filling is a furphy is to think of your system as a rigid rod with a weight on the end. This system will have a resonant frequency of oscillation. Adding more passive weight into the 'rod' only changes the resonant frequency generally lower and does nothing for the damping.
Rigidity of the 'rod' is the best way to stop unwanted oscillations. Rigidity raises the resonant frequency which is easier to damp. Foam in the aluminium legs will do this but if the legs are flimsy to start with the effect will be be minimal.
There is no substitute for rigidity. A light tripod will only hold a light weight.
Hope this helps. Bert
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