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In answer to one of your questions, yes , seeing conditions can make a huge difference, most nights are not greeted by steady seeing in this part of the country. When you do get a steady night you will notice the difference pretty quickly. As Startrek ( Martin ) also said, imaging while the planet or moon are still as high as possible in the sky also helps the seeing to be as good as possible at the time. That may not always be possible if you are trying to capture specific events such as shadow transits, Red Spot etc.
If you are using an dslr for the capture and the sensor has large pixels then you can certainly barlow the system to f20 and get better image scale and resolution. Paying attention to getting precise focus is also most important and getting a fast frame rate helps to freeze the seeing so that Autostakkert etc can have better reference frames to work with.
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