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Russell,
You are restricted by the Dawes Limit of the mirror, as to how much resolution you can achieve by lucky imaging.
D.L = 120arcsecs / Aperture(mm) For your mirror it is 0.4arcsecs.
Sampling rate is 206.3 x Pixel size / Focal Length (assuming 3 micron px)
At F5 your sampling at 0.41arcsec/px (= to Dawes limit)
At F15 your sampling at 0.13arcsec/px (3 times Dawes limit)
At F25 your sampling at 0.08arcsec/px (5 times Dawes limit)
For imaging the experts say we should be sampling at 3 times our required resolution.
You would be OK at F15 and I don't think the 183 cam will show any difference in resolution to your 1600.
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