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Chris,
I'd expect you've probably saturated the sensor in the area around the Trapezium so there are limits to what you can recover. Ideally, you'd have taken one or more sets of subs with shorter exposures to capture detail in the brighter parts of the image.
In PixInsight you can use HDRComposition to combine image stacks taken with different exposure lengths.
HDRMultiScaleTransform can certainly flatten an image and needs careful use. Masks can help. LocalHistogramEqualization can also be used to bring back some contrast.
Cheers,
Rick.
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