Lots of people on here know more than I do, but my experience is, if you are seeing lots of cows, you are probably looking in the wrong place.
I went on that hunt with a friend a few years back and our Manti late experience was that the big bulls generally go off on their own and look for rough nasty country to hang out in and lick their rut wounds. I don't have any specifics on where those places are because we never found them.
Best of luck!