I am having a hard time with my Light Brahma's breaking eggs getting into and out of nest boxes while setting. My current hen started with 8 eggs cause I didn't want to overload her she is in a standard apple crate which has worked just fine for regular egg laying hardly ever had a broken egg. In last 2 years I have never gotten a clutch to hatch because eggs get destroyed and the hen stops setting.Of the 8 at day 20 she still has 3 under her she has broken 3 others in last 2 days and before I let anymore hens go to set I was wondering what is the best height for the lip of a nest box for heavy breed chicken cause I believe she is breaking them when she gets out and hops down from her once daily feed and watering and she is only hen in this pen. For setting hens would a 2x4 boards or 2x6 boards box with straw be high enough to keep her from knocking the eggs out? Or am I missing something else with these large breeds I raised reg size hens in apple crates before and never had any of these problems but these big girls 9-10lbs hens seem to crush eggs easy.