Lapping the Spade Connectors

I was just curious if anyone has tried this? If so, what were your results?

Background: I frequently lap my copper heatsinks for my computer (sand---->polish mirror finish)to get a better contact and keep my overclocked parts running a couple of degrees cooler (a measurable difference). I was think with all the debate over spades and banannas that a better contact may be worth it for speaker terminal conduction too.