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Russ,
Deep Sky Stacker is a popular , user friendly, reliable and excellent free open sourced software to stack your raw data images prior to post processing
I’ve written procedures to stack multiple nights data using either OSC/DSLR or Mono data ( see attached )
In regard to PHD2 and polar alignment, you can get away with 10 arc minutes of PA error and still guide successfully ( although some image shift / rotation over time may occur ) You don’t have to be obsessive or compulsive about super tight polar alignment , around a few arc minutes if fine ( refer PHD2 user guide ) but most folk aim for an arc min or below. I’m usually around a few arc minutes and image up to 1250mm focal length with 5 min subs , dithering and tight round stars.
I’ll also attach some of my PHD2 docs as well
Good luck and enjoy
Sounds like your doing that already
Cheers
Martin
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