I'm struggling with getting my backgrounds even and neutral and had a few questions:
1) I tend to use DynamicBackgroundExtraction in PixInsight using a Tolerance of 2.0 and a smoothing factor of 0.5 ... what starting parameters do you use before Sample Generation?
2) Do you use DBE on individual channels or on the RGB?
3) Do you use LocalNormalisation and, if so, under what circumstances?
An example is the below image of M51 where I still have background issues:

Original is here:

M51 with only 3 hours of integration
1) I tend to use DynamicBackgroundExtraction in PixInsight using a Tolerance of 2.0 and a smoothing factor of 0.5 ... what starting parameters do you use before Sample Generation?
2) Do you use DBE on individual channels or on the RGB?
3) Do you use LocalNormalisation and, if so, under what circumstances?
An example is the below image of M51 where I still have background issues:

Original is here:
M51 with only 3 hours of integration