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Lewis is mistaken, you do not need fast refresh rates to guide well. Infact it can be detrimental. I would leave it at 2 seconds. The reason being is that anything under 2 seconds will "chase the seeing" meaning your mount will make corrections that are not due to the star moving but are due to atmospheric refraction. With a 2 or 3 second guide exposure you average out the seeing and a better position of the guide star can be computed. The guide star that you will guide on will also have a higher signal to noise ratio, which is better for guiding.
Infact the guiding on your image looks ok, the odd stars in the corner look like field curvature, are you using a flattener?
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