I'm a bit more aggressive about weaning chicks off heat than CT.
Your chicks probably could have done without any heat at all a week ago. The heat guidelines are much too oppressive, as far as I'm concerned. It's been my experience that chicks need far less heat than most people think.
When I brought my day-olds home, they were installed in a brooding pen outdoors on May 10. I live in Colorado where spring comes late, so it was 30s at night and not over 69F during the day. Yet those one-day old chicks were running around all that first day, only going under their heat source (heating pad) for quick warm-ups.
They are just turning four weeks old tomorrow and they are living in the coop with no heat whatsoever, and have been all week. The nights are still in the low 50s.
Your temps are as hot as most brooders without having to supply any extra heat. I would be surprised if your chicks are even using their heat plate much any more. Chicks are usually pretty efficient at weaning themselves off heat.
At four weeks of age, they should be feathered out enough that you could remove their heat source all together, and in a couple days after that, move them outdoors into their coop.
I transition my chicks to the coop using their heat pad cave with the heat turned off. This year I added another nifty transition device - a cat napping pod. They sleep in that in a nest box until they learn to roost. Then I will remove it and they will have not gotten into the habit of sleeping in the nest shavings.
Here they are all tucked in for the night.