Hurray! My chickens have gained their weight back! My eldest and I did a chicken check and all the chickens are heavier. They feel much healthier too. No mites under the wings, vents all look fine (and it is apparent that some are laying), no bumbles, but some have some very prominent scales on their feet. So another round of vaseline on the feet at night is in order. On the encouraging side, more feathers are growing in on their feet, so maybe the last two rounds of scaly leg mite treatment helped some.