Having the squish tight will help reduce detonation through better cooling of the piston crown. But you have to reduce the compression down to sensible levels. That will naturally cut into the squish area a bit and bring msv about right.
Clearly the piston crown should be parallel to the head. Wedged shape is not a tool required with a reasonable engine on OK fuel. And never a wedge closing in to the center.
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'07 EC300 GG
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