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Nice image Jerome. I like the framing, creative and it fits in the main features.
The stars do look a bit muted. Not sure what you mean about matching the star profiles. Luminance is always sharper than the rgb stars. What you don't want is one RGB with much fatter stars than the others as that give nasty halos, like a red ring or blue ring.
In that case either reshoot the offending RGB with close attention to focus and matching the seeing as well as you can. Or doing a bit of deconvolution on the offending larger starred R G or B.
Otherwise the luminance tends to shrink the stars anyway.
The shockwave around NGC6164 is mostly in O111 and somewhat in Ha. But it takes a fair bit of exposure to bring it out. Best to use 2x2 binning on the O111 and Ha. 6188 also looks very good in narrowband. In some ways better than in LRGB.
I have just spent a LONG time on NGC6188 so these nuances are fresh in my mind. I need to collect more S11 and will have a complete set of data. 11 hours is good but narrowband is going to require another 11 hours or so.
Greg.
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