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Last night added more OIII data and now have 7 hours in total (3nm filter at f/4.5 and 1.6 arcsec pp). To my eye, drizzle has done a better job at pixel rejection than a few algorithms I tried in PI. I have not been dithering enough, only once every 3 or so subs.
Throughout the night, as the telescope was moving away from the CBD, mean ADU value dropped by 600 between the first and last sub. That's huge! Getting decent signal in OIII is a real challenge from where I live.
The image on the most right is a single 15 minute sub. The next one up is integration of 28 15-minute subs without rejection, then with rejection and the most left one is drizzled data. Looks okay to me.
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