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Peter - I don't use any guiding and am having no problem getting 3-4 minute subs with just using the polar alignment scope.
Your image is nice btw. Just needs more signal to average out the noise. You can also use the Lab colour noise smoothing technique in Photoshop, GIMP or whatever to clean that up a bit. Before you do any stretching, change to Lab colour mode, select the 'a' channel and Gaussian blur it a few pixels: 3 to 5 pixels should do. Do the same to the 'b' channel. Change back to the RGB colour mode. The colour noise should now be greatly suppressed.
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