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There is probably little point to chasing more image scale optically (by using barlows etc) with an 80mm scope. The diffraction limit of the scope is about 1.5 arc seconds, while the size of Saturn's disc is roughly 20 arc seconds. In your pic it's about 30 pixels in diameter, so already about 2.5x oversampled. That level of oversampling is a good thing because it helps with processing. But any more is unlikely to yield much better results.
It's precisely because of the inherently low angular resolution of the small aperture scope (which in digital terms more-or-less equates to about a 12x12 pixel frame for the planet's disc) is why getting an image as good as this is so impressive.
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