Robbie,
Bear in mind, that the more exposures you take (once stacked) it will assist in removing noise.
Mind posting a 5-minute light and dark frame here so we can see just how bad it is?
Stack 40-odd images at 5-minutes a pop and you'll have a virtually noise free image. Bearing in mind that dark frames should be taken immediately after the light frames. I take, at a bear minimum, one hour worth of darks.
Regards,
Humayun
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