This is not normal behavior. You might start a thread on this and see if anyone has any suggestions as to why this is happening.Those are products I woukd use. There is no guarantee diatamious will work by itself. I may have been a little extreme with how I handled. I however wanted the mites gone . Scrub ..spray ..and dust chickens. New bedding.
Right now I have a chick about 3 months old that keeps turning summersaults and now that I quarented the little lady I have observed she is doing this on purpose ...I was afraid it was wry kneck. She is definately flipping on purpose..I just don't know why.