It was obvious they were hitting from the markings on the piston.

Does the top of the piston look deformed at all in the areas that were hitting ? Or still totally flat ?

Even a 1.4mm gasket, with potentially 0.7mm raised at rock ( which may get worse when warm )...is still cutting it close.
That's only 0.7mm clearance.

It will probably be ok, but it is close