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Parroting the rest here, but plate-solving is the way to go. I've just discovered it and haven't fully utilise it but it's pretty awesome.
The other thing I used to do was set binning to 8x and push the display white point right down to about 2-4k... I've always been able to see the thing I'm looking for with <= 5 sec subs that way. Having said that, probably the dimmest thing I've looked for is NGC 55.
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