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I think that what you are seeing is the difference between deck height and piston to head clearance. A deck height (what you measured with the verniers) of 1.25mm is fine from what I've read and is about what I've seen on the engines I've built. The clearance from the head can be more (as in your engine) or less depending on the shape of the piston and head. I think it has to do with the chamfer on the head inside the sealing surface. I'd put it together with the .5mm gaskets like you measured with and call it good.
-Andy
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72 Carrera RS replica, Spec 911 racer
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