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How have you set the gain and offset values for your QHY8 Duncan? This can make a big difference to the final image with a QHY8.. when I had mine, the default values in Nebulosity 2 were Gain 50, Offset 124. after working out what settings I needed by taking bias frames and adjusting the values so that I had an average of between 800~1000 ADUs in a bias frame, the settings were Gain 0, Offset 64. This always provided me with a very nice image..
As Jase said, the screen stretch is not manipulating the data in any way, just changing how its displayed on the screen, it is also not indicative of what the final stacked, processed image will be...
Are you shooting RAW or Colour? I would recommend shooting RAW..
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