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Ho hum... a thought experiment:- machine three bobs as right cylinders of
constant diameter: one of aluminum, one of lead: both these of the
same mass: and a third bob, this one of the same diameter and volume
as the aluminum one, but made of lead.
Conclusion: if your experiment did not confirm that shedding bobweight
reduces Q and hence reduces steady state amplitude for constant
energy input,
you did not control enough factors :-)
Brian W