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I would say your least expensive option is to try an extension tube on your 2X barlow. See how that works out first.
I don't recommend a 5X barlow, but perhaps a 3X with a bit of extension would get you to 4X and f20. I think that is a reasonable image scale vs average seeing.
I'll try to find your photo!
Tell me, how are you focusing? What frame rate are you able to capture at, and finally, what software are you processing with?
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