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David, I find that with a OSC Ha narrow band captures always seem very noisy/grainy and maybe dithering would help but it also might be inherent in using the colour sensor. Why not swap cameras just for your Ha data capture. Guide with the 2600 and capture with the 290. I think there will be less noise and if your image scale is not too big for the 290, then all you do is register the Ha data into your RGB capture. I guess it depends on your processing skills and how effective it will be but the grainy Ha is probably reducing the quality of your OSC data capture by trying to reduce its noise in post processing.
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