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Thanks for the comments
Raw processing in DPP. Adjust colour temp of flash shots to 5500'C. Adjust exposure if necessary, check output JPG profile. No denoise, sharpening at level 3 process to JPG.
In PS I routinely use Noiseware pro to denoise at it's lowest setting - this takes care of all but extreme high ISO noise. I now find that I rarely have to do any levels correction in PS. I would then do any minor cropping (if necessary) sharpen using USM set at 200,1,1 but faded normally to around 50% (but adjust to taste) and save that shot as my master jpg at quality 12. I reduce the size of the shot for web posting to 9cm short side at 180 DPI, resharpen this with USM at 200,1,1 but faded to around 30% and save this at quality 10. This gives a file about 960 pixels longest side and between 100Kb to 200Kb size.
Any stacking is done between RAW and PS processing