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My thoughts about the grooves and the squish distance is this.
The piston area above the rings including the bevel around the top of the piston and the head gasket gap contains fuel mixture to be burned. Tight squish (.040) forces turbulence into the main flame front but does little for igniting the perimeter area. Closing the gap 35* after the spark fires. This is quench as defined, quenching the uncontrolled burn of the perimeter gasses, stopping the detonation.
The grooves squirt mixture and cause turbulence not only into the main flame front burning in the combustion chamber, but also squirt towards the cylinder wall, displacing the mixture trapped in the piston perimeter.
If the squish distance is closed too much (.040), the perimeter area is cut off from the burning flame front and the possible burning of the mixture in the piston perimeter area is cut off.... quenched... stopping efficient burning.
It seems that opening the squish to .070 might allow that burn to continue whereas .040 might cut it off.
Just thoughts and speculation on my part, but I have been following the grooving for a couple years and I believe that it works.
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