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I find binning the guide camera 1x1 gave better guiding than binning 2x2 or 3x3. If you are using SBIG self guide then yes 2x2 or 3x3 may be needed for those little 237 chips.
If you are getting blocky stars at 3x3 binning or more then a solution is a higher pixel guide camera. The Starfish is 1.3mp and is cheap with subsecond guide exposures available.
I think its way worthwhile to invest a bit extra in the guide camera as it is a vital part of the autoguiding setup.
From your image though it looks like your autoguiding was superb.
Greg.
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