Piston dome question?

I'm much more concerned about the condition of the inside surfaces of the ring lands. The perimeter of any piston where the ring grooves are never comes near the cylinder walls and could look like a golf ball and have no issues. But - the top ring particularly HAS to seal against the top and bottom of its groove (at different times during a 4 cycle period) and if that doesn't work well, the rest is all moot. Do those pits go into the ring grooves at all? BTW - do NOT blast the ring grooves. Use a wire wheel or scotchbrite by hand. The only areas of a piston that can be safely media blasted is the top of the dome. Which in your case looks like a very pretty ash tray :D.