Where does the poop fall to?
What size mesh do you use?
I didn't have much luck with the ceramic heater either, just didn't give a wide enough range of heat over a big enough area.
Tho I still use a 60W red incandescent light(controlling heat output with a dimmer extension cord),
during the first couple days to observe the activity and health of the chicks(only during the day),
I've settled on using this for chick heat:
I dropped mine from a 120w bulb to 100w today. I work from home so I figure I can check on them enough to be sure it's okay in the next day.