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As has been mentioned Dawes limit does not apply to planetary imaging as Dawes limit applies to human eye acuity of equally bright stars and their separation with no contrast between them.
Planetary imaging is about contrast, the Encke division in Saturn's outer most ring is 0.05" and is easily imaged on good/vgood nights even in 8" scopes. CCD's take many frames a second so can discern even slight contrast differences in amongst the turbulence.
At your FL 0.2/pixel is fine as has been said, you could push further on the best nights which is part of getting to know your scope and seeing.
Regards, John.
Last edited by John Hothersall; 18-05-2014 at 12:15 PM.
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