The major thing you are missing is winter. Those deer have places to migrate. Look at Idaho two years ago the wintering grounds got pounded deer died. Robby denning who is a big deer killing machine says five to seven years after that winter with ideal conditions. The deer here have no where to go and our winters on a normal one is way harder than the ones where the deer migrate. We get six straight open winters nice rain in the spring summer hope to hell a disease does not come and wipe out the deer even if the weather was nice blue tongue. Then avoid people driving on the road which out west they go high where our deer are just in the open. Mountain lions and coyotes. I think the deer out on the high plains here have a much lower survival rate just because of the harsh conditions we live in. The other thing about Colorado is they went to a draw because they wiped the deer herd out trying to get rid of cwd. Personally this has been one of the best years ever for seeing 180 plus deer which has been 2 one is dead and the other is still running around hopefully I still have a bow tag and after actually seeing one on the hoof and holding it I can say a lot of the other 180 I saw were probably 160 or so. I would put our deer on even a more weather dependent cycle than deer Who migrate for winter hunting has some affect but Mother Nature is who decides. Plus I have been trying for over 16 years to get a 180 inch mule deer on public land and few things have felt that good when I did this year I wouldn’t want it any easier.