Although Bruce is right about extreme overexposure blocking up the highlights, I don't agree with him about reducing development. Furthermore, most modern films will take 3-4 stops of overexposure before the highlights start to be affected. A shutter running a bit slow is not going to overexpose them that much at all. Extra density just means you'll have to expose longer. I have a couple of "mistakes" that proper proof blank white, but still make stunning prints.
Reducing development will reduce contrast, which you likely do not want. Print a neg and see how it does. And send your shutter in for a CLA...
Best,
Doremus
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