Thanks Chris and Alex. I can definitely get more faint detail out, but my skills at present can't do that while also keeping the large amount of noise from the 550D in spring under control. So I stayed conservative. I'm currently using Photoshop but beginning the long journey of learning Pixinsight.
Thanks also Sil. The Rosette was purely a proof of concept to myself that I had at least got guiding working, so no calibration frames at all. When the crazy winds finally subside I can try guiding again and will be trying to get a few hours on the Rosette. I'm hoping longer exposures will boost my SNR enough to help mitigate the noise issues above a little bit.
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