A person may be able to get an idea if thats the issue by putting a dowel down the sparkplug hole and pushing down on the front, then back, and repeat, to see if you can feel the piston rocking and how much. If it is .01" (.25mm) undersize it will rock noticeably.
As long as it's an honest mistake no point in being aggrivated toward him. If he's got any morals he'll be pissed off at himself just for doing it much less getting ragged on extra. Just depends how it turns out as to whats going on, maybe something simple is going on.
Didn't think of it earlier but if your at .25 over , a 96mm may be all the bigger piston needed.
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