I think your temp is fine then! If you see them never going under it or staying far away from it all day, that’s a sign it’s too warm in the brooder. 😊
Do your chicks huddle under it, stay far away from it, or just hang out at the edges?
Many times if you measure the heat under a plate it can be high, but like the plate a mama hen doesn’t decrease temps under her feathers. If the temp on the far side of the brooder away from the plate is 95...