The last one is looking pretty good, Simon.
Are you using a mask to protect the brighter (higher SNR) areas when you do noise reduction? For noisy data I usually do a light noise reduction with MultiscaleLinearTransform and a linear mask before stretching and then some additional noise reduction afterwards, often with TGVDenoise. For a troublesome background you can build a RangeSelection mask and then hit it hard.
Cheers,
Rick.
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