I think the pastel 'lines' can all look really good and they can all also look like browned out crap.
IMO the normal genes that the pastel is combined with make all of the difference. A blushing normal x nice pastel makes for great pastels, and a dirty pastel x blah normal will make crappy pastels.
Once we have the desired genetic mutation in a BP we have to consider the overall genetic makeup of the animal and how the 'normal' traits affect that mutation.
When I was a kid we used to breed 'show quality' poultry and actually did quite well. Its all about breeding for a group of specific traits, so keep back your best stock and breed from those; you'll end up with amazing animals.
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