From what I have read the cleanest, whitest black eyed lucys are from a pairing of Pro Exotics' line of fire called the lemonback. I believe them to be somewhat rare, however, as Pro Exotics burned down in late '11, destroying their collection and they were not overly prevalent prior to that tragedy. As to cleaner fires breeding cleaner lucy's I cannot be much help, though in theory it sounds plausible.