Hang in there Brett, you're not doing anything wrong. I got out last night because I too believed the conditions here in Melbourne were to be better than average for planetary viewing/photographing. Seeing and transparency were going to be around 8 to 9 according to Skippy Sky but the high velocity Jetstream cancelled out any chance of benefiting from that.
Here are shots taken with a DSLR through an 8 inch Newtonian. The first two from last night were taken with a 5X Powermate and the last one, last year, with a 6mm eyepiece and a 2X Barlow. The difference is only really in what you can get with the atmospheric conditions on offer at the time. If you get good conditions, you'll be amazed with the difference it makes to your final image. Note the white spots you're talking about in last year's image.
Continue with what you're doing because one night you'll be out there in those perfect conditions and you'll achieve that image you're aiming for!
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