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Looks pretty good there.
Dust bunnies are handled with proper flats - no flats? Or are supposed to.
I always feel its way better to clean the camera and filters periodically rather than depend on flats.
I don't bank on them absolutely correcting dust bunnie but use them anyway. Some scopes need flats more than others.
An FSQ needs them somewhat as there is a certain amount of lightness dropoff at the edges of the image.
These dust shots tend to be slightly greenish I notice. Its a hue of the dust and not necessarily all gradient (often light pollution is worst in the green channel).
A simple and very effective way of handling the green is use Gradient Xterminator. It elminates all sorts of sins even shots taken from a dark site.
I'd also say your focus was off somewhat as a well focused FSQ has the stars looking like sand ie. tiny pinpoints.
Do you focus by hand or by electronic focuser? I did it by hand for ages and then found out how easy and nice a robofocus was to use and I also use a FLI PDF which is even nicer to use. It makes exact focus so much easier especially on an FSQ where the critical focus zone is pretty tight and also where the scope will be out of focus slightly if you get more than 2C temperature change. it is a bit sensitive to temp. You can setup the Robofocu to adjust for temp changes if you want. I haven't taken it that far but it consists of training the software for the various temps and then let it rip.
Greg.
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