"... I cut all my landing boards off including that 2" porch... the bees don't need them, but the mice seem to like them..."..
Well, I decided to do exactly the opposite - put up a tilted landing board from plywood so the bees can walk into the hive.
Just got tired picking up 30-40 cold bees from the grass in front of the hive each and every evening.
Young bees go out in the afternoon, sit on grass to take a break, then never are able to take wing again (they get too cold).
Loosing so many young bees (and few tired and cold forages too) every day just makes no sense to me.
Trying the walk-up ramp and see what happens.
I got #2 mesh in all my entrances.
PS: this board maybe less important in warm summer months;
but now is May in zone 5 and the ground is still cold and not going much warmer anytime soon.