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@gbj_tester
Potentially, since it's possible to make a strong enough seat post from carbon fibre which is less stiff than a strong enough aluminium one. This also applies to CrMo and Ti posts, aluminium is a shit choice for making springs :-)
If you want a lot of twang, it's worth considering a skinny post with a shim, since the same amount of material strain on a thinner tube will yield a greater deflection.