Just my opinion but i don't think I would mirror polish the combustion chamber and have proved that a mirror in the intake is a bad idea.
A mirror combustion chamber may be a good idea for detonation problem, but don't see any other advantage. Texture keep the air/fuel mixed in the port..............why wouldn't it do the same in the combustion chamber. I wouldn't polish up the combustion chamber any smoother than 80 grit on a cast iron head. here is a picture on top of a piston, that still make me go, Hmmm, was this machined????? or a nos created piston. Ask the owner of the piston but never got an answer. it was posted on facebook to show the crack on top to the piston.
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If that pIston was intentionally made that way, and i think it was..........why would you want a polished combustion chamber.!?