Hi Adrian
You're off to a good start, accurate guiding and focus is the main criteria for imaging anything. Why not image the planetary at the scopes native F10 instead of using the reducer and using the reducer and barlow together is contradictory, they're both trying to achieve the opposite to each other. Why not get an 1.5X barlow if you want increased focal length but don't want to go to F20.
More exposures and increased exposure time per frame would also help.
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