Are their tails relatively thin indicating minimal fat storage? This seems to be a common thread amongst socal chuck keepers I have known. Unless you have your heart set on breeding you would do well to avoid brumation altogether, or perhaps a very abbreviated down time. I'm presuming they were fasted before cooling to insure no food was present in the stomach or intestininal tract. Prophlactic administration of "Flagl" i.e; metronidazole for anaerobic bacteria and protozoans common in wild lizards might be of help.