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Good luck with that Craig! I hope last night went well.
The movement you noticed before focussing would most likely be air currents in the tube as it cools down, atmospheric turbulence, or a combination of both. Tube currents are normally slower and more regular than atmospheric turbulence.
The "tad dull" image in the 8mm eyepiece is probably due to the small exit pupil/high magnification (I assume the eyepiece is clean?). The view should be brighter in a 12" scope at the same magnification (that would need a different eyepiece though), as well as slightly brighter with that same eyepiece (but at a higher power) because the 12" has f5 optics, and therefore a larger exit pupil to your f5.9 Skywatcher.
All the best,
Dean
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