Ack! Precious babies!
Your humidity should be up and stay up for lockdown, but your temperature needs to stay around 99.5-100* - that's 37.5C, I think - to hatch. As they hatch, they can stay in there 2-3 days at that temperature. Don't change the temperature on the incubator/hatcher.
When you bring them out to the brooder, 95*F for the first week. That's ... erm ... help me here, Professor Google ... ah! 35*C. Then you'll drop the temperature by an additional 5*F (apparently 2.5*C, about) each week for the next five weeks or so, until they're fully feathered (instead of downed) and you've made a solid approach to your natural ambient temperature. During this course of time, keep the heat lamp on one end of the brooder, not in the middle, and you're not shooting for a constant temperature all over the brooder. The babies will be smart enough to huddle under the lamp if they're cold, and to move far away from it if they're hot. With that in mind, you really want your chicks mostly milling around in the middle area, neither huddled or straining to get away. So - adjust the height of your heat lamp - or use a dimmer switch for it, if you have one - accordingly as they grow and need less heat, so that they're naturally staying in a nice wide perimeter around the heat source.
More pictures!