Out of curiosity, do they show their bars very often? When breeding? I thought ours were the same population when yours were younger, but it seems the breeding coloration is very different.
Very on and off for full barring but a dull barring appears quite often, the male is showing his vertical Y-barring at the moment. Female shows it more often than the male.
Unfortunately I have no collection data or information and will never be able to get any.