XP-2 too contrasty

I shot my first roll of XP-2 last week. It was extremely sharp and almost grainless for a 400 ASA film, but the negatives (and processed prints) are very contrasty, with not much detail in the highlights. I shot it at 320, but didn't mention that when I brought it in for processing. I brought it to a place that is a cut above the "corner drug store" sort of processor, but perhaps not a "professional's" processor. What did I do wrong, and what should I do on the next roll to minimize this? Or are blocked highlights just characteristic of the film, and I should reserve it for flat light situations?

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