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Nice one Stuart.
M20 can look great in narrowband if correctly weighted. Ha (green) is weighted too high in the presented image or the weights are correct, but the Ha signal is simply too strong for the other channels. Its pretty easy to judge this given its nearly washed out the OIII around the center and there's very little SII signal.
Extract more detail? Perhaps, but doubt it would be through deconvolution unless you're talking about a multi-layered approach. Looking at the stars, if it was pushed any harder through deconv, the image would take on a harsher appearance - not ideal, but a matter of taste. Probably some basic contrast enhancements is all it would need to provide more depth and sharpness where required. IMO, Great data that just needs a little more work.
Cheers
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