We do have lot's of deer around here. I have a deer "gauntlet" that I have to negotiate through; right out of the 'hood that I ride from every day. I normally do not ride at night; especially during the autumn/late fall when the deer are most active.
I also am an avid deer hunter. With bow and black powder.. I harvest them and eat them. 4 in the freezer at the end of each season is the norm for me.
Deer are very unpredictable. I don't think modulating headlights have any more effect on them; as opposed to other light producing equipment. They will do what they want to do; insanely most of the time when it comes to a motor vehicle.