It would help if you can post some pictures of your birds, but in general, every flock has areas where they shine, and one stubborn fault they are struggling to eliminate (and a big ol' raspberry to anyone who has ONLY one
), along with plenty of "passable but not where I want it." The trick is deciding which you can tolerate, at least short term, and which ones really drive you nuts, and they'll be different for everyone. If you ask 10 breeders what they'll work with and what's a deal breaker, you'll get 10 different answers. But here are some of mine, hopefully some others will weigh in with theirs.
Obviously genetic defects go immediately.Temperament is also high on my list - I don't feed what I don't like. I want a bird with good type/balance/substance, and, in my w/bw/sw, more black in the wings/tails of females and beards on males, and less in the hackles of both. I'll work around sparse beards/muffs to improve something more difficult. While my egg color has been pretty decent in w/bw/sw (buffs- won't go there) I don't get too caught up in it, because there is no standard for egg color. While it is likely the most hotly debated characteristic of the breed, you'll be hard-pressed to find 2 people who agree on what the "correct" egg color is. I'm not saying egg color doesn't mattr, but I'd never cull an otherwise good bird for something so subjective. The exception being white eggs, which I haven't personally dealt with it, but I've heard can be a real headache.
But it doesn't sound like that's what you're seeing. Eggs are bluest early in the season and tend to fade the longer the hen lays. I'm not sure what causes the splotchy color - I had a lavender last year whose eggs looked like Saturn (little alien) - every egg consistently had a band of darker blue (same blue, more pigment) around the middle.
Anyway, not sure if I answered any of your questions, but there is a wonderful book that I purchased at the recommendation of several of our gurus, and I think you'll find it very helpful. I sure did! The book is Start where you are with what you have - A Guide to Poultry Breeding By Ralph Sturgeon and the only place I know of it being available is:
http://www.poultrynz.com/index.php?main_page=product_info&products_id=1297Good luck! Hope to see you at some shows!