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Robert, I don't think at that image scale you have anything to worry about in terms of rotational blur.
Chris Go uses a C11, larger image scale than you, and he captured for 40 seconds on each channel, plus the time taken to rotate filters, so he captures for 130 seconds all up.
For my last few Jupiters, i've been capturing for 120 seconds.
I think the 90s rule that we all have sprouted over the last years is a "theoretical" limit based on rotational speed of the planet and assuming a very large image scale. At the scale we're using, I think 2 minutes, or even 2.5minutes would be ok.
The easiest way to tell, is to take a 2 minute avi, and "blink" the first and last frames in the avi and see if there's any rotational movement.
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