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Trevor, grab a raw sub and put it in DSS in the top right hand corner is a black grey and white levels adjustment. grab the grey pointer and move it to the left. if you see stars there then you are killing them in your processing.
If they aren't there then your not capturing them in which case your bias and gain settings are wrong. The other point is that you may not be focused correctly or your collimation of the telescope is not right.
High F ratio hyperbols and compound telescopes require so little to be out of alignment and then your focus is shot.
Also be careful with minimum filters they kill stars faster than an explosive charge kills fish in a small fish pond. Better control of curves, high pass filters and highlights and shadows will produce stars that are not blown out and in general far better results. I personally do not like the minimum filter in PS because it isn't well suited to astrophotography processing for a mechanical error/defect.
Brendan
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