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Roger - You've taken some beautiful photos! The laser polar alignment approach is ingenious - I can often see the SCP by visually star hopping between Crux, LMC, SMC, and the Octans, but lining it up through the polar scope is a challenging to say the least. The laser would make it very quick and easy.
Peter - Astrotrac claims a peak-to-peak periodic error of <= 5 arc seconds. From what I've read by people who have actually tested it, this is accurate. I'd say that poor polar alignment and tripod/ballhead flexure would be the usual culprit behind trailed stars.
I've used a guide scope with the AT - very good for drift aligning, and PHD works just like with my EQ6 except it doesn't have Dec guiding obviously.
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