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good thread Greg.
Like Mike, I do not use either darks or flats with the 694. Dither in PHD/nebulosity, but RA only (I have a portable system and set up every night, so PA is always a bit off - dither in dec upsets PHD, which works best with single side tracking to remove minor dec drift. If the dither throws the dec to the "no correction" side, it doesn't come back).
Best stacking for LRGB is average with default sigma rejection in Pixinsight - the normalisation routines in the PI stacking algorithms work really well with variable data. For NB, have found that dither plus Pixinsight median works best at cleaning up thermal fixed pattern noise - although it throws away some sensitivity, it still produces measurably better SNR than dark calibration to do the same.
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