What kind of hatch rates did you have with your other cycles? If things are going well according to the numbers then don't mess with changing anything.
Opening the bator to move chicks away from the other eggs is going to cause more problems than the movement by the hatched chicks will. When my broody hens go through the process there is absolutely movement in the nest area between the first chick pecking out and the last.
I've seen where some people have created dividers from cardboard, plastic canvas, using egg cartons with the bottoms sliced off, etc...but realistically their hatch rates may only be marginally better than without.
Good luck!