Trev,
Nice M42 and 10/10 for effort
The Trap stars at your image scale / focal length are pretty small , tracking / guiding has to be tight , seeing has to be good and focus has to be tight as well.
Only my observation but your stars don’t look like tight focus ?
Even with super short subs , focus has to be tight ( all night long )
You could try some Layering tools with super short subs say 5sec and longer subs at 30 sec, not sure if PS has such a feature ? ( Startools has a Layering module where you use foreground and background images to expose the core of M42 )
Cheers
Martin
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